Influence of Probiotics on Atopy, Immunological Responses and Gut Microflora - Follow-up to 5 Years

Probiotics are helpful bacteria of healthy gut and have shown potential in reducing allergy. A double-blind, randomized placebo-controlled clinical trial studying the effects of 6 months probiotics supplementation from birth on allergic disease and sensitization up to 2 years of age had been conducted. This study aims to assess the longer term beneficial effects of this form of intervention on the incidence of allergic disease and sensitization at 5 years of age by extending the follow-up period.

All children (from original cohort of 253) who completed the initial 2-year visit has been invited to participate. They will be evaluated with monthly phone calls and yearly clinic visits. Allergic sensitization will be assessed with skin prick tests to a panel of allergens.

This project will provide insights into the role of early supplementation of probiotics on the development of the immune system and its effect on allergy. The additional follow-up period is critical for the evaluation of respiratory allergies in the form of clinical asthma, allergic rhinitis and sensitization to inhalant allergens, which tend to develop after 2 years of age.

Inclusion criteria

• Parents agree to the subject's participation in the study and informed consent has been obtained.
• The subject has been a participant in the Phase I double-blind, randomized placebo-controlled study and had taken either normal infant formula or formula supplemented with probiotics postnatally for 6 months.
• The parents are willing to comply with study procedures and are able to keep to scheduled clinic visits.

Exclusion criteria

• The parent is unable /unwilling to comply with procedures.