Varicella (Chickenpox) in Florida

The number of varicella cases reported in May 2024 increased from the previous month and was above the previous 5-year average. Due to robust vaccination programs, there is no longer discernable seasonality for varicella cases in the United States.

In May 2024, 87 varicella cases were reported in 18 counties, outlined in black in the map. From March 2024 through May 2024 the average county rates varied throughout the state.

In 2024, 415 varicella cases were reported. The annual number of reported varicella cases increased from 2018 to 2019 and decreased significantly in 2020, 2021 and 2022. Cases reported in 2023 returned to levels similarly observed prior to the 2020 pandemic.
*CDC MMWR report year

In May 2024, the varicella rate was highest among <1-5 year olds at 2.54 cases per 100,000 population.

In May, 13 cases were household-associated and 21 cases were outbreak-associated. For most varicella cases, exposure to other known cases is not identied. In Florida, transmission setting is not routinely identied for non-outbreak cases.

People with shingles infection can transmit the virus that causes varicella to people without immunity. In May, 7 cases reported having contact with someone diagnosed with shingles during their exposure period.

In May 2024, 79% of cases reported with varicella had not received the recommended number of varicella vaccinations for their age or had unknown vaccination status. Vaccination against varicella is important for infants, children, teenagers, and adults. If a person was born before July 1, 1994, the current varicella immunization recommendation would not have been implemented when they were receiving their childhood immunizations. Based on the case’s age, 81 cases in 2024 would not have been vaccinated under the current childhood immunization recommendations.

In 2024, the majority of adults aged 19 years and older with varicella were not up-to-date on their varicella vaccinations or had unknown vaccination status. Although individuals who have been vaccinated can still develop varicella, complete and timely vaccination remains the best way to prevent varicella and severe complications.