Listeners, today’s public health alerts in the United States focus on several key concerns including measles outbreaks, avian influenza H5N1, and increased human parvovirus B19 activity.
According to the Centers for Disease Control and Prevention, as of April 17, there have been 800 confirmed cases of measles in 25 states. This is already more than double the total cases reported in 2024 and marks the sharpest rise since measles was declared eliminated in the U.S. in 2000. The vast majority, 94 percent, of cases are associated with 10 outbreak clusters. Texas is experiencing the brunt of this surge, accounting for 597 cases, with Gaines County alone reporting 371 infections. Other states impacted include Alaska, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Indiana, Kansas, Kentucky, Maryland, Michigan, Minnesota, New Jersey, New Mexico, New York City, New York State, Ohio, Oklahoma, Pennsylvania, Rhode Island, Tennessee, Vermont, and Washington. There have been two confirmed deaths, one additional under investigation, and 11 percent of cases have resulted in hospitalization. Most cases—96 percent—are in unvaccinated or vaccination-status-unknown individuals. The CDC and state health agencies have issued updated vaccination recommendations and are urging healthcare providers to stay alert for additional cases, especially among children under five and those with unknown vaccination status. Texas’s outbreak, in particular, has led to new clusters in Upshur County and has spread to nearby states, including New Mexico, Kansas, and Oklahoma. Kansas is reporting 37 cases across eight counties, while Michigan and Montana have reported their first outbreaks in decades. The CDC warns that this year’s total may soon surpass the 1,274 cases seen in 2019, which was the highest since eradication status was declared.
Another key alert today concerns avian influenza. As of mid-April, the CDC reports 70 confirmed and probable human cases of H5N1 avian influenza in the United States since the outbreak began in 2024, including one death. While there is still no evidence of person-to-person transmission, the virus has spread extensively among wild birds and dairy herds, prompting nationwide surveillance and increased testing. As a response, the FDA has fast-tracked a new mRNA vaccine, ARCT-2304, which is now in early clinical trials as a pandemic preparedness measure.
Finally, the CDC and California Health Alert Network are highlighting a significant rise in human parvovirus B19 activity in the U.S. This respiratory virus, which transmits through respiratory droplets, has shown a marked seasonal increase. Reports indicate that the percentage of people testing positive for parvovirus B19 has risen from less than 3 percent in the 2022–2024 period to 10 percent in June 2024, with the most dramatic rise seen in children aged five to nine. Among this age group, recent infection rates jumped from 15 percent to 40 percent during the same period. There are a
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