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H1N1 Flu (swine flu)

For the latest rating of this disease according to the World Health Organization, visit our Current Situation chart. updated April 30, 2009

Recommendations for Health Care Providers


Swine flu appears to present with symptoms similar to seasonal influenza. Cases may range from a mild respiratory illness to fulminant disease.  Just as with seasonal influenza there is likely risk of secondary bacterial infections or exacerbations of chronic comorbidities.

Healthcare isolation

At the current time, the CDC is recommending droplet, contact and respiratory precautions for patients suspected of harboring swine flu. Early triage and cohorting of respiratory illness in the emergency room setting would theoretically decrease transmission rates. Hospitalized patients should ideally be placed in a single bed room with negative pressure flow and high rate air exchange if available. If single rooms are unavailable , cohorting proven cases appears reasonable. It is currently recommended that healthcare providers to these patients should wear fitted N-95 masks, gowns and gloves when interacting closely with these patients. In seasonal influenza, the rate of viral shedding decreases significantly after 5 days, although children may shed the virus for more than a week. As always, frequent hand washing with soap and water or an alcohol based hand hygiene system is the cornerstone of nosocomial infection prevention.


Swine origin H1N1 is predominantly susceptible to oseltamivir and zanamivir, although rare reports of resistance have been reported. The virus appears to be resistant to the adamatanes (amatadine and rimantadine). Treatment with oseltamivir or Zanamivir within the first 48 hours of illness may decrease the duration and severity of symptoms, and theoretically would decrease the risk of subsequent disease transmission.

As with all influenza, the risk of secondary bacterial infection is high.  Clinicians should watch for signs of sudden exacerbation of illness, bimodal disease course, or unexpectedly severe disease as these may be signs of secondary bacterial infection.

Given increasing rates of community acquired MRSA colonization and infection over the past decade, MRSA coverage in individuals suspected of secondary bacterial infection should be considered.

Recent CDC Treatment Guidelines

(summarized at

Technical Resources for Professionals

Printable Posters

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