Reducing Contagiousness with Oseltamivir

Evidence for Reduced Viral Shedding

• The Centers for Disease Control and Prevention recommends that oseltamivir treatment can reduce viral shedding, and persons treated with oseltamivir can shed susceptible viruses early in treatment and may later shed drug-resistant viruses, including after 5-7 days of therapy 1, 2

Important Caveats

• The MMWR Recommendations and Reports suggest that immunocompromised patients may experience prolonged viral shedding even after oseltamivir treatment and may require extended treatment duration beyond 5 days 1

Practical Recommendations

• The CDC recommends continuing standard infection control measures, such as hand hygiene, respiratory etiquette, and avoiding close contact with others, even while taking oseltamivir, as the drug reduces but does not eliminate viral shedding 3

Duration of Influenza Contagiousness After Starting Tamiflu

Understanding Viral Shedding with Oseltamivir Treatment

• Oseltamivir shortens illness duration by approximately 1-1.5 days in otherwise healthy patients, according to the American Academy of Pediatrics 4

Impact on Household Transmission

• Treatment of index patients with influenza reduces transmission to household contacts to some extent, with short-term administration of oseltamivir (75 mg once daily for 7 days) potentially reducing the risk of illness in household contacts when administered within 48 hours of symptom onset in the infected person 4