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Among 176 patients who had had severe acute respi-
ratory syndrome (SARS), SARS-specifi c antibodies were
maintained for an average of 2 years, and signifi cant re-
duction of immunoglobulin G–positive percentage and titers
occurred in the third year. Thus, SARS patients might be
susceptible to reinfection >3 years after initial exposure.

Medical experts on Friday warned that patients who had recovered from the virus were
still at risk of being infected again, and said people should avoid any mass gathering,

Zhan Qingyuan, head of infectious diseases at the China-Japan Friendship Hospital,
said in a press briefing on Friday that people who had already had the virus would have
developed antibodies but should remain on alert so they did not get ill again.


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