New York City has had 273 confirmed cases of the notorious “explosive diarrhea” parasite since May 1, The Post has exclusively learned. According to an NYC Health Department spokesperson, the city has seen an increase in cases of cyclosporiasis compared to previous years, with 301 people sickened so far for the entirety of 2026. The number includes people who both have and have not recently traveled internationally. The department is still investigating where and how the infected people may have been exposed, working in conjunction with the CDC, the FDA and other health departments, the spokesperson added.