U.S. figure skater Vincent Zhou couldn’t join his team at the Winter Olympics closing ceremony on Feb. 20 after being flagged as a COVID-19 close contact, despite testing negative for the disease more than a dozen times. “I won’t be marching in the Closing Ceremony tonight,” Zhou wrote on his Instagram story on Sunday. “Before boarding the bus to the stadium, they flagged me as a COVID ‘close contact’ risk and would not allow me to proceed further.” The 21-year-old California resident expressed his frustration, given every effort he had made to prevent infection. “I have tested negative 14 times in a row,” the post reads. “I have antibodies and am not contagious whatsoever. I am 100% healthy and normal. I am double-masked and would be walking outdoors with the same people I am about to travel with in a couple [of] hours. Out of everyone marching, I would be …