01/12/2026
Infectious Disease Round Up:
Measles:
The US is approaching the one-year mark of continuous transmission of measles in the country, threatening the country’s measles elimination status. Since the beginning of 2025, there have been 2,147 cases in the US. A majority of new cases are occurring in Arizona, South Carolina, and Utah. There are 3 new cases in the Cleveland area , all in the same family. Their exposure was most likely the outbreak in South Carolina.
Pertussis:
US pertussis cases have climbed to more than 28,000 according to CDC reports, with 20 states surpassing previous year totals amid declining diphtheria, tetanus, and pertussis (DTaP) vaccination rates. Tetanus:
At least 37 confirmed tetanus cases were reported in the United States in 2025, marking the highest annual case count in over a decade due to widespread declines in kindergarten diphtheria, tetanus, and pertussis (DTaP) vaccination coverage.
COVID-19:
COVID-19 wastewater concentrations, test positivity, and emergency department (ED) visits due to COVID-19 have been increasing in the US. However, hospitalizations due to COVID-19 and deaths remain relatively low, particularly compared to this time last year.
Seasonal Flu:
Seasonal Flu cases may be slowing down in Ohio, but this may also be due to decrease reporting over the holidays.
RSV:
Wastewater and CDC data show increasing RSV activity in the US over the month of December, but wastewater activity is lower than this time last year most likely due to increasing uptake of the new RSV vaccine.
Bird Flu:
There have not been any new cases of avian flu in dairy cattle herds since mid-December, and no new human cases of avian flu globally.
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