OHA release - What you need to know: Pertussis, also known as whooping cough, is a bacterial infection that spreads easily through droplets when someone coughs or sneezes.  Pertussis can cause severe disease in people of all ages, but babies are most at risk of serious illness, hospitalization and death from infection.  Vaccination is important for people of all ages, and it's the best way to prevent severe disease and hospitalization.  PORTLAND, Ore - Pertussis cases in Oregon have reached an all-time high, prompting state officials to urge people to make sure they and their families are up to date on vaccinations—especially those who are pregnant or spend time with babies—and take steps to reduce spread.  In 2025, as of today—Dec. 10—Oregon Health Authority has received a record-high 1,475 reported cases of pertussis, also known as whooping cough, breaking the state's all-time annual record of 1,420, set in 1950. The current outbreak began in spring 2024, when Oregon recorded 1,252 pertussis cases by year's end. Other U.S. states have reported similar caseload spikes.  Pertussis can cause severe disease in people of all ages, but babies are most at risk of serious illness, hospitalization and death from infection. To reduce that risk, the American Academy of Pediatrics recommends every pregnant person receive a single dose of Tdap vaccine during their third trimester (weeks 27-36) to protect their newborn from pertussis. That's because babies' immune systems are too week to protect against infection until they get vaccinated at 2 months old.  Spouses, partners, grandparents and any adult routinely in the baby's life should also consider receiving a Tdap dose at least two weeks before the baby is born.  However, vaccination is important for people of all ages, and it's the best way to prevent severe disease and hospitalization. In addition to pregnant people, pertussis vaccination is recommended for infants and children starting at 2 months through 4 to 6 years old, adolescents at age 11 or 12, and any adult who has not previously been vaccinated.  “I worry people may not fully appreciate the risk pertussis poses as case counts are rising, especially for babies and older adults," said Howard Chiou, M.D., Ph.D., medical director for communicable diseases and immunizations at OHA's Public Health Division. “One of the most important things someone can do to protect their newborn is to get the Tdap vaccine during pregnancy. Unfortunately, we've seen a statewide decline in maternal Tdap vaccination rates in Oregon, which is a dangerous trend."