Asthma and early childhood infectious disease. Critical time for protective effect of large family on asthma may not be during first year of life.
Ponsonby
A L
AL
Kemp
A
A
D000367:Age Factors; D001249:Asthma / Q000821:virology*; D005191:Family Characteristics; D005500:Follow-Up Studies; D006801:Humans; D007231:Infant, Newborn; D012141:Respiratory Tract Infections / Q000150:complications*