A new study led by researchers at National Jewish Health has revealed that, while a wide range of viruses can cause lower respiratory tract illnesses (LRIs) in infants, certain viruses and viral combinations dramatically increase the risk of severe disease. The findings, published this month in Journal of Infection, come from the Puerto Rican Infant Metagenomic and Epidemiologic Study of Respiratory Outcomes (PRIMERO), which followed more than 2,000 children from birth to age two between 2020 and 2024.
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