Early oseltamivir treatment reduces ICU admissions and speeds recovery in children, large US study finds

A comprehensive nationwide study demonstrates that prompt use of oseltamivir in children with flu significantly lowers ICU admissions and shortens hospital stays, reinforcing current treatment guidelines amid concerns of declining antiviral use.

A large nationwide study has found that children hospitalised with influenza were less likely to need intensive care and tended to leave hospital sooner when they received oseltamivir early, reinforcing long-standing guidance to treat suspected or confirmed flu in admitted patients.

The research, published in JAMA Pediatrics and led by experts at the University of Colorado Anschutz, analysed more than 7,000 paediatric hospitalisations captured through FluSurv-NET, the CDC-backed surveillance system for laboratory-confirmed flu admissions. According to the study, children given early oseltamivir were 31% less likely to be admitted to an ICU than those who did not receive the antiviral.

The findings add weight to earlier work showing that prompt treatment can shorten recovery time. A previous JAMA Pediatrics analysis of 55,799 children hospitalised with influenza also found that oseltamivir given on hospital day 0 or 1 was associated with a shorter length of stay. The latest study went further by accounting for when symptoms began and when treatment started, which the authors said gave a more rigorous real-world picture of the drug’s effect.

Suchitra Rao, the study’s senior author and a paediatric infectious diseases specialist at Children’s Hospital Colorado, said the results were especially relevant after one of the harshest flu seasons in years. She said the data showed oseltamivir could lower the risk of critical care even when treatment began after the first 48 hours of illness.

The study also arrives amid concern that antiviral use in hospitalised children has fallen, despite national recommendations to treat suspected or confirmed influenza as soon as possible. FluSurv-NET, which the CDC says has monitored flu-related hospitalisations since the 2003-04 season and now covers more than 90 counties in 14 states, has become a key source for tracking severe flu outcomes and shaping public health guidance.