Influenza (flu) is a contagious respiratory illness that can be severe and life-threatening, especially for older adults. This time of year is called "flu season." In the United States, most seasonal flu activity typically occurs between October and May. Flu activity most commonly peaks in the United States between December and February.
Adults at or over 65 years of age and residents of nursing homes and other long-term care facilities are among those at highest risk for developing flu complications that can result in being hospitalized and occasionally in death. The Centers for Disease Control and Prevention (CDC) recommends a yearly flu vaccine for everyone 6 months of age and older as the first and most important step in protecting against this serious disease.
People should begin getting vaccinated soon after the flu vaccine becomes available. However, as long as flu viruses are circulating in the community, it's not too late to get vaccinated.