What has caused the problem and why now? - Hygiene

The odds ratio for a positive allergy blood or skin test was 1.59 (95% CI: 1.10, 2.28). The authors concluded not only that early antibiotic use was associated with asthma and allergy at 6 years of age, but also that protopathic bias (antibiotics used to treat early symptoms of asthma) was unlikely to account for the main findings. Almqvist . et al ................
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