Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 9/1/2025

Influenza Control Guidelines

Current Recommendations

  • The European Centre for Disease Prevention and Control recommends early isolation at home of people feeling unwell and feverish when influenza is circulating, as quarantine is not generally recommended for routine influenza cases due to practical challenges and the rarity of pre-symptomatic transmission 1, 2
  • The Centers for Disease Control and Prevention, as reflected in MMWR Recommendations and Reports, suggests that institutional outbreaks, such as those in nursing homes or hospitals, require more stringent control measures including isolation of confirmed or suspected cases 3, 4

Personal Protective Measures

  • Regular handwashing and good respiratory hygiene, such as covering the mouth and nose when coughing or sneezing, are strongly supported as key components of personal protective measures against influenza 1, 2
  • The use of masks in healthcare settings for those with symptoms of acute respiratory infections is recommended 1, 2

Institutional Outbreak Control

  • Droplet precautions and establishing cohorts of patients with confirmed or suspected influenza are crucial in controlling outbreaks in institutional settings, according to guidelines from the Centers for Disease Control and Prevention 3, 4
  • Re-offering influenza vaccinations to unvaccinated staff and patients, restricting staff movement between wards or buildings, and restricting contact between ill staff or visitors and patients are also important measures 3, 4

Healthcare Settings

  • Patients with influenza requiring hospitalization should be placed in isolation using Standard and Droplet Precautions, with private rooms preferred, as recommended by infection control guidelines 5
  • Healthcare workers should wear appropriate personal protective equipment, including surgical masks, gloves, and gowns, when caring for influenza patients 5

Important Considerations

  • Patients with influenza are contagious to others 1 day before symptoms develop and typically remain infectious for approximately 5 days after symptom onset, although this can vary depending on the individual's health status 5
  • High-risk settings, such as nursing homes and healthcare facilities, require more aggressive control measures due to the presence of vulnerable populations, including the administration of chemoprophylaxis to all residents regardless of vaccination status during outbreaks 3