Journal of Biosciences and Medicines, 2014, 2, 56-64
Published Online May 2014 in SciRes. http://www.scirp.org/journal/jbm
How to cite this paper: Shigwedha, N., et al. (2014) More than a Few LAB Alleviate Common Allergies: Impact of Parapro-
biotics in Comparison to Probiotical Live Cells. Journal of Biosciences and Medicines, 2, 56-64.
More than a Few LAB Alleviate Common
Allergies: Impact of Paraprobiotics in
Comparison to Probiotical Live Cells
Nditange Shigwedha1,2,3*, Lanwei Zhang1*, Liubov Sichel3*, Li Jia4*, Pimin Gong1, Wenli Liu1,
Shumei Wang1, Shuang Zhang1, Xue Han1, Wei Gao1
1School of Food Science and Engineering, Harbin Institute of Technology, Harbin, China
2Department of Food Science and Technology, University of Namibia, Windhoek, Namibia
3Pure Research Products LLC, Boulder, USA
4Wyeth Nutrition, Suzhou, China
Email: *ndita firstname.lastname@example.org m, *email@example.com, *firstname.lastname@example.org m, *jiali cad@gmai l.com
Received March 2014
The evidence in this paper indicates that the alarming increase of common allergies can be re-
duced by the intake of particular “probiotics” or “paraprobiotics” along with food. This appears to
build a consensus in the pharmaceutical and food communities about the role of probiotics in the
prevention and treatments of common allergies. Food allergy is one of the common allergies, de-
fined as an adverse health effect arising from a specific immune response that occurs reproducibly
on exposure to a given food. Improving the digestion of foods and maintaining a healthy gastroin-
testinal (GI) tract is certainly critical to controlling food allergens. Therefore, the association be-
tween a leaky gut or an impaired intestinal permeability and food-allergenic reactions is ex-
plained. Gluten has been found to be somehow a justification for protein allergy, and should,
theref ore, be avoided by people with celiac disease. In several, in vitro models, surface layer (S-
layer) proteins of selective paraprobiotics have shown potential in alleviating food allergies and
intestinal disorders. Notably, lactobacilli paraprobiotics have proven to be the immediate immu-
nomodulators against common allergies and other diseases, including viral (flu, hepatitis C), bac-
terial (bronchitis), asthma, chronic fatigue, fibromyalgia, gastrointestinal distress, and autism
disorders in humans.
Paraprobio tics, Food Allergy, S-Layer Proteins, Immunoglobulin E (IgE), Probiotical Cell Lysates,
Lactic Acid Bacteria (LAB)
Probiotics are live microorganisms that when administered in adequate amounts, confer a health benefit on the
N. Shigwedha et al.
host . In contrast, paraprobiotics are non-viable microbial cells (intact or broken) or crude cell extracts which
when administered (orally or topically) in adequate amounts, confer a benefit on the human or animal consumer
. Probiotics, paraprobiotics, and their composites have been confirmed to confer health benefits to the hosts
depending on the strain and ingested amount . These include the suppression of the inflammatory disorders,
inflammatory bowel disease (IBD), rheumatoid arthritis, atopic dermatitis, establishment of tolerogenic immune
response, and more. The anti-inflammatory activities and modulation of local and systemic immune response by
paraprobiotics are becoming extremely popular in these days. Various species of lactic acid bacteria (LAB), Ba-
cillus, and fungi such as Aspergillu s and Saccharomyces have been used over the years in the pharmaceutical
and food industries. However, a few have gained probiotic status. Most of these belongs to the genera Lactoba-
cillus, Streptococcus, Bifidobacterium, and Lactococcus. Numerous probiotics have gained recognition for their
therapeutic health benefits, including help to regulate digestion, aid in lactose digestion, resistance to enteric pa-
thogens (Salmonella sp., Escherichia sp., Listeria monocytogenes, Clostridium sp., and Candida sp.), the anti-
colon cancer strength, immune system modulation, anti-allergy, and hepatic and anti-encephalopathy, as well as
for having a protective effect against diarrhea. Both food and pharmaceutical industries have a well-established
market in the use of strain-specific probiotics and/or paraprobiotics for the positive health benefits on humans.
They are typically found in beverages or designed as dietary adjuncts (in tablet or capsule formats). They can
also be integrated into baby foods or in different milk powder formulations.
Food allergy, which all the main emphasis of this review, is an abnormal immune response of a person
prompted by the consumption of certain food proteins . The incident of allergic reactions to foods is one of
the most challenging global problem because of its increasing prevalence. An estimate made by the World Al-
lergy Organization indicates that about 220 - 250 million individuals around the world are suffering from food
allergies to the range of approximately 5% - 8% (in infants and children) and 1% - 2% (in adults) . The rea-
son the prevalence of food allergies continues to grow has been worrisome for many years. The hygiene hypo-
thesis proposes that the intake of nearly sterile foods and improved sanitation have increased and changed our
exposure to environmental microbes. In addition, the use of antimicrobial medications or vaccinations might
have contributed to the development of allergic reactions to certain foods in human . Until now, there is no
singular medication for common allergies and the solution appears to reside within probiotics and their related
products. Many people believe that the adverse immune reactions can only be prevented by circumventing the
offending allergens. However, avoidance of the offending allergens is difficult because trace amounts of aller-
gens in food can trigger an allergic reaction that may include fatal anaphylaxis. Cow milk, eggs, soy, wheat,
peanuts, tree nuts, fish, and crustacean (shellfish) cause most of the food allergic reactions, and some are also
the first foods causing anaphylaxis. Food served in restaurants or other food service operations may be conta-
minated with undeclared allergens. The undeclared allergens may accidentally come in processed foods through
various ways, such as improper handling and labeling, cross-contact (in-process and post-process), and ineffec-
tive or insufficient equipment sanitation procedures.
2. Background of a Healthy Digestive Tract and Food Allergy
Food allergy is an immunological phenomenon. Reasons for both food allergies and non-allergic food hypersen-
sitivity (formerly known as food intolerance) is a “leaky gut” or increased intestinal permeability (Figure 1) .
When the gut lining is damaged by either pathogenic bacteria, poor diet, sulfites, alcohol, smoking, gastrointes-
tinal (GI) infection, inflammations, or stress, the partially digested food gets into the bloodstream (Figure 1) and
can cause an immune response. In a healthy digestive system (Figure 1(A)), the nutrients in food are digested
exclusively into their smaller units (for example, glucose, fructose, and galactose for carbohydrates; and amino
acids for protein) before being absorbed into the bloodstream. The tight junctions of the intestinal lining act like
closed doors that prevent allergens, incompletely digested-food constituents, bacteria, and toxins from passing
into the bloodstream. With a leaky gut (Figure 1(B)), the tight junctions do not function as they should. The in-
completel y digested-food particles, toxins, allergens, and bacteria in the intestines can go right into the blood-
stream. These compounds can overwhelm the immune system, trigger food sensitivities, and affect the func-
tioning of the body (causing or worsening joint pain, skin problems, allergic symptoms or autoimmune condi-
tions, headaches, and so on .
It is necessary to show that food allergy is often associated with hypochlorhydria or less stomach acid .
Reference  reported that the food proteins that are ingested and appropriately digested are harmless. There-
fore, understanding the basic knowledge of digestion is necessary. Digestion is dependent on a 3-stage process
N. Shigwedha et al.
Figure 1. Normal intestinal permeability (A), Leaky gut or increased intestinal permeability (B). Modified
from reference .
of breaking down foods. The 1st stage, called predigestion, occurs in the mouth and esophagus. The 2nd stage
takes place in the stomach and relies on stomach acid and the enzyme pepsin. The 3rd stage occurs in the small
intestine, where additional digestive enzymes complete the breakdown process, and nutrient absorption finally
occurs. Predigestion of food in the mouth and esophagus can be compromised by the simple act of failing to
chew the food thoroughly. Moreover, it can be influenced by the food’s people choose to eat. Foods that are low
in enzyme contents or that are highly processed can lead to poor predigestion, when entering the stomach. Over
time, this takes a toll on how much stomach acid human body can produce. Aging also effectively reduces the
amount of stomach acid that humans could produce. Therefore, aging coupled with a reduction in stomach acid
(triggered by poorly predigested food passing into the stomach), can affect the 2nd stage of digestion. The 3rd
stage of digestion can be affected by a deficiency of pancreatic digestive enzymes, leading to a compromised
digestion of food particles . Apart from salivary and pancreatic α-amylases that are only needed in starch di-
gestion, humans do not have the intestinal enzymes needed to digest dietary fibers. Consequently, they make
their way intact to the colon, where they will be bacterially fermented, together with unabsorbed nutrients.
Compromised digestion, no matter the cause, only means that food allergens are entering the bloodstream.
Proteins in the bloodstream lead to immune response and food allergy  . Another outcome of hypochlor-
hydria is fermentation of undigested food in the bowel, which results to symptoms such as gas, bloating, and
upset feeling. This is not happening when consuming properly digested and fermented foods, preferably with the
presence of active probiotics.
3. Fermented Foods in Combating Common Allergies and Food Intolerances
Probiotic bacteria in fermented foods can be fundamental constituents to help rebalance the gut flora. It is do-
cumented that various probiotics can detoxify the body, synthesize essential nutrients, and boost the immune
system . The popular fermented foods with recognized probiotics include yogurt, sour cream, kefir, sauer-
kraut, kimchi, crème fraîches, kombucha, and more. Sauerkraut and pickles sitting on the shelf are less likely to
contain live probiotics in them. Here, the recommended advice is to look for fermented foods that are refrige-
Dietary studies have advocated that long-term consumption of yogurt can reduce some of the clinical symp-
toms of allergy in adults with atopic rhinitis or nasal allergies, and can lower serum levels of Immunoglobulin E
(IgE), particularly among the elderly . Besides, milk whey formula supplemented with L. rhamnosus GG
could alleviate some aspects of atopic allergy and intestinal inflammations among infants . In breast-fed in-
fants whose mothers consumed L. rhamnosus GG, the clinical scores of eczema were reduced excessively .
The mode by which common allergies are reduced with the consumption of fermented foods is somewhat
strange, but several theories exist, including the ability of probiotics to hydrolyze allergenic food molecules en-
zymatically, the stabilization of the gut mucosa sufficiently, and systemically reduce the uptake of food-borne
allergens . A distraction of the intestinal microflora (mainly endogenous probiotic bacteria) has been reported
as one of the significant events related to allergic diseases .
Bifidobacteria and lactobacilli are the main yogurt strains, and their role in allergic and healthy infants have
been intensively investigated. The 2 groups have been shown to modulate the host’s immune responses to po-
N. Shigwedha et al.
tentially damaging antigens, and down-regulate hypersensitivity reactions in humans  . Probiotics have
been also shown to modulate the phagocytosis differently in allergic and healthy individuals. In allergic persons,
d o wn-regulation of the inflammatory response was detected, whereas, in healthy individuals, there was an im-
munostimulatory effect  . Other probiotic strains of the Bacillus genus are also reported to aid in diges-
tion while at the same time reduces allergenicity . Catalase and subtilisin produced by Bacillus species have
been shown in vitro somehow, to stimulate Lactobacillus sp. growth in a synergistic way . However, failure
to reduce the risk of atopic dermatitis by L. acidophilus supplementation has been reported  .
Lactose-intolerant people are advised to ingest daily fermented dairy products (yogurt and/or kefir) because
living probiotics in those products would have enough time to ferment all the lactose as opposed to only one
portion of various yogurts. In addition, it is advisable for allergic/intolerant people to casein (the main protein
found in milk), or to the main whey proteins (α-lactaglobulin and β-lactoglobulin found in milk of ruminant spe-
cies), to avoid fermented dairy products. For the probiotic strains in fermented products (pH around 4.5) to reach
their benefits, these food products should not be heated and should be kept cold or refrigerated at 4˚C before
consumption. At this temperature, the survival counts (log CFU/mL) are expected to last much longer during
storage than the products stored at the room temperature.
4. Paraprobiotics in Combating Common Allergies and Additional Diseases
Research has demonstrated that paraprobiotics too subscribe to the overall health status of humans. The probiot-
ical cell fragments (PCFs), currently enjoying growing popularity as immunomodulators contains, among other
components, cell wall peptidoglycans and DNA fragments immensely contribute to the health status of humans.
The paraprobiotic product “Del-Immune V®”, is manufactured by Pure Research Products, LLC, Boulder, Col-
orado, USA, as a food supplement for immediate immune system support . CytoFlora® is another paraprobi-
otic product containing cell walls of L. acidophilus, L. plantarum, L. rhamnosus, L. bulgaricus, L. salivarius, L.
casei, L. reuteri, L. sporogenes, B. bifidum, B. infantis, B. longum, and S. thermophilus .
Preliminary experimental and clinical data indicated that the cell lysates of L. rhamnosus V are highly effec-
tive in prevention and treatment of infectious diseases, common allergies (food allergy, bronchitis, hay fever,
and asthma), hepatitis C, chronic fatigue, and fibromyalgia . The PCFs of L. rhamnosus V lysates are tech-
nically validated to: accelerate normalization of humoral immunity; to reinforce the actions of natural killer (NK)
cells and phagocytosis; to increase production of interleukins (IL)-1, IL-2, and tumor necrosis factors (TNFs);
significantly increase T-lymphocyte cells; to normalize the amount of IgAs and IgGs; to increase resistance
against bacterial and viral infections; to prevent side effects against antibiotics and cyclophosphamide usage; to
induce cytosuppression, and significantly reduce toxic side effects . These paraprobiotics motifs have a
combined effect on colon cancer and useful in making chemo- and radiotherapy possible without doubt  ,
and are strongly involved in the regulation of T helpers (Th1 or Th2 paths) of the immune responses. As part of
PCFs, peptidoglycans (muramyl peptides; MPs, muramyl dipeptides; MDPs, muramyl tripeptides; MTPs), lipo-
teichoic acids (LTAs), and DNA motifs are suggested to be promising LAB ingredients for healthcare products.
These have been shown to activate the neutrophils through nucleotide-binding oligomerization domain-con-
taining protein 1 (NOD-1) and NOD-2. The neutrophils are the main cellular component of the innate immunity
Another dietary supplement Delpro® , consisting of a series of 5 probiotic strains (L. acidophilus, L. casei,
L. delbrueckii, B. longum, B. bifidum; 2 billion CFUs each) formulated with the immunomodulator Del-Immune
V® (L. rhamnosus V lysate; 8 mg) has indicated significant advantage in the treatment of GI pain and autism
spectrum disorder (ASD) among children . Paraprobiotics may also be able to provide health benefits de-
spite a brief exposure to stomach acidity and bile salts following ingestion. Figure 2 illustrates that, although a
log-scale reduction in probiotic cell viability may occur during digestion, a number of probiotics may still pass
through the gut, depending on the dose . Some cells may be injured or die, but through their PCFs, they too
would be able to provide the beneficial effects on human health. Therefore, PCFs as paraprobiotic fragments
may serve as “novel nutraceutical ingredients” and this establishes a consensus in the food and medical indus-
tries about their role in the development of a strong immune system, anti-allergy, anti-inflammation abilities,
and prevention and treatments of various infections or diseases in humans and animals.
5. Probiotic and Paraprobiotic Formulations for Maintaining Health Status
To what seems to be effective, it is advisable that both children, adults, and senior citizens should accompany
N. Shigwedha et al.
Figure 2. The 5 steps of how probiotic bacteria may recover from excessive
exposure of stomach acidic and high bile salts.
their diets with probiotics cultures and/or PCFs on a daily basis. The fermented foods, probiotic dietary supple-
ments, and paraprobiotic formulations offer a combination of different probiotic strains or their valuable cell
fragments which exert the beneficial effects to the host. Besides, it is necessary to educate consumers and make
them aware that the proportion of each probiotic strain or their lysates in a package varies from batch to batch.
Different combinations of probiotics are more likely to mitigate the leaky gut problems and provide the gut flora
with the required needs. Most commercial yogurts or probiotic drugs contain 1 - 9 registered probiotic strains.
Recently, it has been demonstrated that formulations of different lactobacilli in association with bifidobacteria
were not opposed to each other and had an immunomodulatory effect on Staphylococcus infec tions . In
another study, different probiotic cultures of L. casei, B. longum, B. bifidum or L. casei, L. acidophilus, B. bifi-
dum, and B. longum were found to be on components of future probiotic drugs effective in treating staphylo-
coccosis and for immunity correction . As there seem to have been so many claims on probiotics, the Euro-
pean regulatory legislation requires extensive validation for biological activity of both independent probiotic
cultures and their combinations, which would allow for the development of functional probiotic drugs based on
monocultures of bifidobacteria and/or lactobacilli or in their various combinations .
To individuals that are already healthy, both probiotics and paraprobiotics are still needed to maintain the
health status because digestive health, and a balanced gut flora work together in a synergistic way. To that effect,
reference  prescribed minimum probiotic bacteria intake of 1.5 × 1010 - 2.0 × 1010 CFU/day for adults. It is
further recommended that children require specific formulations of probiotics with slightly smaller amounts.
Likewise, unique formulations of PCFs are required, depending on the targeted beneficial activities in different
body organs. Additional epidemiological studies are worth the effort on these subjects as everyone is different
and has a distinctive gut flora.
6. Surface Layer (S-Layer) Proteins in Alleviating Intestinal Disorders and
S-layer proteins can be isolated and be part of PCFs or paraprobiotics. They are observed to adhere to mucus or
intestinal epithelial cells in a competitive nature against enteropathogenic bacteria of Clostridium perfringens
, Escherichia coli O157:H7, Salmonella Typhimurium , and Clostridium difficile, Shigella sp., and Sal-
monella sp. . Seemingly, the location of S-layer proteins at the outermost surface of some lactobacilli strains
implies that it plays a role in adhesion. If the S-layer proteins of lactobacilli are removed or damaged, the adhe-
sion of these lactobacilli to the host epithelial cells is reduced . The S-layer proteins seem to be a perfect
surface structure in most of lactobacilli and various bifidobacteria . These 2 genera are also preferred for
study due to their wealth in early fecal samples from newborns and their postulated role in common allergies
May die or
BILE SALT (<0.6%)
Exposure does not
mean health benefits
CELL MAY RECOVER
Mediated through cell wall
(pH 2 - 3.5)
Exposure does not
mean health benefits
IN GI TRACT
May also contribute to health benefits
N. Shigwedha et al.
improvement. Lactobacilli in particular, enjoy some additional properties that make them suitable for many ap-
plications, namely, their generally regarded as safe (GRAS) status, ability to induce mucosal and systemic im-
mune responses against associated antigens, and impressive immunomodulating properties.
S-layer -coated liposomes have been proposed to be excellent candidates to be used as antigen carriers due to
their potential to surface-display proteins and epitopes, as well as their intrinsic adjuvant means . Reference
 have demonstrated the potential to surface-expose epitopes as part of the L. acidophilus S-layer proteins.
Single S-protein or SA-protein was found in more than 105 copies per cell, and the emergence of antigens on the
surface of lactobacilli was proposed to be useful in the development of oral and/or nasal vaccines . Another
approach is that recombinant fusion of allergens and S-layer proteins could improve vaccines for immunot her a-
py of atopic allergies . The impact made here is that several lactobacilli and bifidobacteria possess additional
properties that allow them to halt the spread of common allergies. The S-layer proteins are also found to have
aggregation ability of biofilm formation . This is another most significant distinguishing characteristic for
scientists to explore the possibilities of probiotic biofilm (p-biofilm) formation in food allergy conditions while
restoring a leaky gut caused by either aggressive gut flora or other sources of initiating the inflammations.
S-Layer proteins are known to fulfill a wide range of functions such as acting as: 1) structure involved in cell
adhesion and surface recognition; 2) protective coats, molecular sieves, and molecule and ion traps; 3) virulence
factor in pathogenic organisms; and 4) patterning elements .
7. Gluten, Gliadin, and Glutenin as a Reason for Protein Allergy
In food chemistry, gluten, gliadin, and glutenin in wheat are classified as conjugated plant protein, prolamins,
and glutelins, in that order. It is surprising that most of the individual prolamins fall into the variety of conju-
gated plant proteins. The prolamin content of gluten is usually taken as 50%. Gluten is a tenacious elastic pro-
tein, consisting of a mixture of glutenin and gliadin, especially of wheat flour that gives cohesiveness to dough.
Glutenin proteins are similarly elastomeric, form insoluble polymer networks with rubber-like elasticity, and
build multidomain cross-linkers too . Intuitively, glutenin is also challenging because it cannot only be rec-
ognized by the same intestinal gliadin-specific T cells among other T-cell populations, but also demonstrates
that the glutenin-specific T cells most likely are an integral part of the pathological T-cell repertoire within the
celiac lesions . The ingestion of these gluten proteins from wheat, rye, barley, or their crossbred varieties
induces an inflammatory response that destroys the villous structure of the intestine and impairs its ability to
absorb nutrients, especially in patients suffering from celiac disease  . Until today, finding a replacement
of gluten proteins in bakery products remains a significant technological challenge. The examples of prolamin
from wheat is gliadin, from barley is hordein, from rye is secalin, and from oats is avenin. It is reported that glu-
ten intolerance is a physiological disorder that leads to gliadin allergy, from which more than 500,000 people
suffer in the United States alone .
Although not all gluten varieties seem to have the same effect in people with celiac disease or non-celiac glu-
ten sensitivity, they can all be problematic for digestive health . Foxtail millet, pearl millet (Omahangu), and
sorghum are gluten-free and have a legitimate chance of being commercialized for the food-based control of
gluten problem. Rice, rye, corn, amaranth, teff, quinoa, buckwheat, and chia are also identified to be gluten-free.
For individuals suffering from gluten intolerance and/or celiac disease, grains containing gluten with the com-
bination of some amino acids in the gliadin family seem to create the most problems. The grains blacklisted on a
gluten-free diet include wheat and its relatives (triticale, spelt, kamut), barley, rye, and sometimes oats.
Oats do not contain gluten per se, but they are almost always contaminated with gluten (unless specifically
labeled gluten-free) since they are usually processed on the same equipment used for wheat and other glu-
ten-containing grains . Table 1 shows different kinds of processed foods where gluten can hide in a diet .
However, the extent to whether the leaky gut formation is only in gluten allergy conditions or any allergen pro-
teins from different food create a leaky gut system needs to be further investigated.
8. Concluding Remarks
It is challenging to predict that the food supply can be made allergen-free because most food proteins and even
sulfites (in foods) are potential food allergens. Various diets that allergic people love best are probably not al-
ways the best for their precarious conditions if eaten moderately or in excessive amounts. Supplementation of
probiotic formulations (live probiotic cells, paraprobiotics, and/or probiotic-paraprobiotics in combinations) ap-
N. Shigwedha et al.
Table 1. Foods where gluten, gliadin, and glutenin hide in a diet.
where gluten, gliadin, and glutenin hide
Breakfast cereals, muesli, regular oatmeal, bagels, toasts, muffins, croissants, pancakes,
smoothies made with wheat germ, an
Burgers (maybe in the bread and the meat
patty), Sandwiches (perhaps in the deli meat, pizzas, and bread), breaded chicken,
imitation bacon, salads with croutons, barley soup, dumplings, sushi (in the tempura, soy sauce, or imitation crab), soups (i
the noodles or the thickening agent), bulgur salad and seitan.
sagna, spaghetti, rice and risotto (particularly from the seasonings), meat pies (from the sauce in the filling and the crust),
noodles, stuffing, chicken nuggets, sausages, bulgur, frozen French fries (from the coating), and couscous.
granola bars, nachos, yogurt with granola, potato chips (from the flavoring), and pretzels.
Cakes, cookies, pies, graham crackers, muffins, scones, puddings, baked goods
(made from wheat flour or graham flour, or containing glutenous ingredients)
, brown rice syrup, candies, and some yogurts.
Some tamari sauces, soy sauce, malt vinegar, some salad dressing, many seasonings, sauces and marinades,
flavorings, gravies, spice blends, and more.
Spirits made from grains, beer,
various mixes and liqueurs (from the thickening agents)
Some vitamin and mineral supplements, play dough, lipsticks, some medications,
personal hygiene and cosmetic products, communion wafers, glue on envelopes and stamps, and
pears to have both an immediate and long-term successes in curbing common allergies, depending on the probi-
otic containing product taken. Thus, screening of anti-allergy probiotic strains would be a leading step in re-
search about formulating PCFs for common allergies. As food-allergy has been observed to be intuitively out-
grown with age, this expresses the maturity and advancement of the digestion system in human. However, ex-
tensive cooking of the plant source allergens appears to simplify the protein quality and palatability of the celiac
diet. Extremely dry heating by modern food-processing devices including irradiation, ionization, and a few oth-
ers need to be investigated further because they are alleged to create complex and diverse group of compounds,
called advanced glycation end-products (AGEs), and/or advanced lipid oxidation end-products (ALEs). Once
these products are partially absorbed into the systemic circulation, they also may have adverse health effects in
human. The answer now appears to depend on the adequate intake of probiotics or paraprobiotics in their dif-
Special Grant (2013M541397) from China Postdoctoral Science Foundation is acknowledged for funding. To
John Justo Ambuchi for proofreading.
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