[The response to PPD and its relation to allergic diseases in children vaccinated at birth with BCG].

Background: The increase of the atopical disorders can be partially explained by two factors, the infectious disease in developed and developing countries, and the changes in immunization programs, infections such as measles, whooping cough or tuberculosis can modify the immune response. Recent studies have demonstrated that an inverse relation could exist between the response to late cutaneus hypersensitivity to Mycobacterium tuberculosis and atopic condition. Also, a strong positive response has been associated with low levels of IgE and Th1 cytokines.

[Calisthenics as a preventive measure against the decrease in maximum expiratory flow in asthmatic patients before and after a soccer game].

Background: Exercise-induced asthma is a syndrome characterized by dyspnea, thoracic pain, cough, sibilant rales and diminished physical performance. It appears into the first 30 minutes after the beginning of physical activity.

Objective: To evaluate calisthenic effect on maximal expiratory flow rate in asthmatic patients.

[Hypersensitivity detected by skin tests to food in allergic patients in the Hospital Infantil de México Federico Gómez].

Background: The prevalence of food allergy depends on the feeding practices of different parts of the world. Peanuts and nuts cause a great part of allergies in the United States; in Spain and Portugal are commonly due to fish, milk; in Italy seafood and mustard in France. In Mexico we don't know the frequency of food allergy and involved groups of age or specific foods.