August 21, 2026
August 21, 2026 DHW Communications The Department of Health and Welfare (DHW) is issuing a health advisory for Grasmere Reservoir and the Bruneau Arm of CJ Strike, urging caution when recreating in or near the water. DHW works closely with Southwest District Health (SWDH), Central District Health (CDH) and the Idaho Department of Environmental Quality...
August 21, 2026
HEALTH ALERT NETWORK Health District 4 Advisory for Healthcare Providers August 21, 2026 Key Actions for Healthcare Providers Educate patients receiving B cell-depleting or B cell-modulating therapies (particularly anti-CD20 monoclonal antibodies) about their increased risk for severe arboviral disease and the importance of mosquito and tick bite prevention. Maintain a high index of suspicion for...
July 13, 2026
HEALTH ALERT NETWORK Health District 4 Advisory for Healthcare Providers July 13, 2026 Health Advisory: Increase in Cyclosporiasis Cases Reported in Multiple States Key Message A large multistate outbreak of cyclosporiasis is ongoing, with more than 1,500 cases reported in Michigan and increases reported in several other...
June 16, 2026
HEALTH ALERT NETWORK – Health District 4 Advisory for Healthcare Providers: Consider Avian Influenza A (H5N1) in Patients with Dairy Cattle or Poultry Exposure Key Messages Local Situation: Avian Influenza A (H5N1) has been confirmed in over 80 Idaho dairy premises, including 12 in District 4 currently under ISDA quarantine. Clinical Suspicion: Consider H5N1 infection in...
June 9, 2026
HEALTH ALERT NETWORK Health District 4 Advisory for Healthcare Providers June 9, 2026 Health Advisory: New World Screwworm Detected in the United States As of June 8, 2026, New World Screwworm (NWS), Cochliomyia hominivorax, has been confirmed in four livestock in Texas and one dog in New Mexico. NWS was eradicated from the United States...
May 22, 2026
May 22, 2026 Key Points for Providers Ebola (Bundibugyo virus) outbreak is reported in DRC and Uganda Low likelihood of U.S. importation at this time Evaluate patients with compatible illness and recent travel/exposure history (=21 days) Early recognition and isolation remain key, though risk is minimal An outbreak of Bundibugyo virus disease (BVD), caused...
May 20, 2026
HEALTH ALERT NETWORK Health District 4 Advisory for Healthcare Providers Idaho Health Advisory: Testing for Hantavirus May 20, 2026 An outbreak of Andes virus, a type of hantavirus, on the cruise ship M/V Hondius has raised concern about the possibility of Andes virus cases in the United States, including Idaho. CDC and public health...
April 29, 2026
Central District Health (CDH) is notifying healthcare providers of an isolated detection of measles virus RNA in wastewater collected on April 22, 2026, from a wastewater facility serving Boise. At this time, CDH has not been made aware of any suspected or confirmed measles cases among residents of Ada County. Detection of measles virus RNA...
November 14, 2025
A multistate outbreak of infant botulism linked to ByHeart Whole Nutrition infant formula has been identified in the United States. As of November 11, 2025, Idaho has no cases associated with the outbreak, but 15 infants with suspected or confirmed infant botulism have been reported by 12 other states. All 15 infants were hospitalized and treated with BabyBIG® (Botulism Immune Globulin Intravenous medication). No deaths have been reported.
March 10, 2025
The Centers for Disease Control and Prevention (CDC) has issued a Health Alert Network (HAN) Health Advisory to notify clinicians, public health officials, and potential travelers about a measles outbreak in Texas and New Mexico and offer guidance for prevention and monitoring. As of March 7, 2025, Texas and New Mexico have reported 208 confirmed cases associated with this outbreak (198 in Texas and 10 in New Mexico). As a part of this outbreak, two deaths have been reported: one in Texas and one in New Mexico. More cases are expected as this outbreak continues to expand rapidly.