Outbreak history on February 1

Historical outbreak-response milestones recorded on this calendar date, drawn from WHO Disease Outbreak News, CDC archives, and primary epidemiological literature.

• 2016

  WHO declares Zika virus a PHEIC

  WHO declared the clusters of microcephaly and neurological disorders associated with Zika virus circulation in the Americas a Public Health Emergency of International Concern. The declaration was driven by the temporal-spatial association with Zika rather than direct confirmation of causation; the causal link to congenital Zika syndrome was confirmed later in 2016.

  Glossary: PHEIC

Browse the full outbreak history calendar for milestones across all dates.