COVID-19 antibody levels declined within two months in 156 front-line healthcare workers involved in a CDC study published Nov. 27.

Researchers collected blood samples from 3,248 front-line healthcare professionals between April 3 and June 19. The healthcare employees worked at 13 hospitals in 12 states.

Overall, 194 participants had detectable antibodies at the beginning of the study. Among the 156 employees who repeated testing, 93.6 percent saw antibody levels decline within 60 days.

28% of healthcare workers saw antibody levels drop to below the threshold for positivity.

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