All employees should stay home if they are sick until for at least 24 hours, both are true: their symptoms are getting better overall and they have not had a fever* (temperature of 100 degrees Fahrenheit or 37.8 degrees Celsius or higher) and are not using fever-reducing medication (e.g., medicines that contain ibuprofen or acetaminophen).
After these two criteria are met, there are some additional precautions that can be taken to protect others from respiratory illness. More information is available at About Preventing Spread of Respiratory Viruses When You’re Sick.
Note: Not everyone with flu will have a fever. People with suspected or confirmed flu, who do not have a fever, should stay home from work at least 5 days after the onset of symptoms. People with flu are most contagious during the first 3 days of their illness. Some people, including young children and people with weakened immune systems may be contagious for longer periods of time.
CDC recommends that workers who have flu symptoms upon arrival to work or become ill during the day should promptly separate themselves from other workers and go home. They should not return to work until for at least 24 hours, both are true: their symptoms are getting better overall and they have not had a fever (and are not using fever-reducing medications).
An important way to reduce the spread of flu is to keep sick people away from those who are not sick. Businesses should review and communicate their sick leave policies and practices to employees every year before flu season begins.
Should household members of sick people stay home, too?
No, an employee who is well and lives with a sick household member may go to work. It is especially important that these employees monitor themselves for illness.
Employees with school-aged children may need to stay home to care for their children. Employers should review leave policies for the flexibility to allow employees to stay home if they need to care for their children or other household members.
Why should businesses have flexible leave policies or alternate work schedules?
An important way to reduce the spread of flu is to keep sick people away from those who are not sick. Therefore, any worker who has flu symptoms should stay home and not come to work. It is possible that employees will need to take care of sick household members or care for children if schools are dismissed or early childhood programs are closed. Flexible leave policies and alternate work schedules will help prevent the spread of flu at the workplace, allow employees to continue to work or function while limiting contact with others, help maintain continuity of operations, and help people manage their health and their family’s needs.
*Many authorities use either 100 (37.8 degrees Celsius) or 100.4 F (38.0 degrees Celsius) as a cut-off for fever, but this number actually can range depending on factors such as the method of measurement and the age of the person, so other values for fever could be appropriate. CDC has public health recommendations that are based on the presence (or absence) of fever. What is meant by this is that the person’s temperature is not elevated beyond their norm.