Superspreader

The new surge coincides with an acute shortage of vaccines in some Indian states, along with the annual Kumbh Mela, or pitcher festival, on the Ganges River, where millions of Hindu devotees bathe to seek absolution, raising fears it could evolve into a superspreader event.

Source: tatoeba (11375596)

In the SARS [severe acute respiratory syndrome] outbreak, New York forcibly quarantined a man suspected of having the disease after he refused to isolate himself. That's a real breach of liberty, but suppose he had been an irresponsible superspreader like Typhoid Mary and caused the disease to spin out of control?

Source: wiktionary

Another SARS superspreader took the invader by the hand to Singapore's 1,200-bed Tan Tock Seng Hospital. Crowded emergency departments and highly mobile medical staff did the honors with more help from superspreaders. One patient alone infected 24 health-care workers, 15 patients, and 12 visitors. […] It [the SARS-CoV-1 virus] quickly found a superspreader in a dedicated hospital laundry attendant who ignored his diarrhea and pneumonia and doggedly stuck to his duties. The workaholic generated 137 infections among patients, doctors, and nurses.

Source: wiktionary

One of the most notorious superspreaders was Typhoid Mary, an Irish cook who was an asymptomatic carrier of typhoid fever. […] Another well-known superspreader was Gaetan Dugas, considered patient zero for the emergence of HIV in North America; he was a promiscuous homosexual with an estimated 250 partners per annum who remained sexually active until he died at thirty-two years of age.

Source: wiktionary