Data collected through the One Health Harmful Algal Bloom System (OHHABS) can help CDC and partners better understand harmful algal blooms and prevent associated human and animal illnesses.
OHHABS is a CDC surveillance system launched in 2016. State and territorial health departments and their designated environmental health or animal health partners can voluntarily report data to OHHABS.
OHHABS collects data on:
- Human illnesses
- Animal illnesses
- Harmful algal bloom events that occur in fresh, brackish, or salt waters
Find OHHABS data by year in the reports below.
Read the 2021 OHHABS Summary Report
Read the 2020 OHHABS Summary Report
Read the 2019 OHHABS Summary Report