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In 2021, there were 11 cases of congenital syphilis (parent to child transmission) in King County, a more than 10-fold increase compared to 2020 when only 1 case of congenital syphilis was identified. Congenital syphilis is a devastating disease that can lead to miscarriage, stillbirth, neonatal death, prematurity, and long-term health outcomes in infants affected. Congenital syphilis is a consequence of rising rates of syphilis among heterosexual cis-men and -women. Syphilis cases among gay, bisexual, and other men who have sex with men are also very high and rising. Currently, reported syphilis cases are low (less than 1%) among transgender and non-binary people.

In response, Public Health — Seattle & King County has created a Syphilis task force which includes a monthly review of real time syphilis data to guide public health interventions. The data presented on this page report on the monthly syphilis case counts by population in Seattle and King County. These data are not final and are subject change. Only the annual STD Epidemiology Report should be used for the most accurate reporting.