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This undated image made available by the Centers for Disease Control and Prevention on Feb. 4, 2015 shows an electron microscope image of a measles virus particle, center. Measles is considered one of the most infectious diseases known. The virus is spread through the air when someone infected coughs or sneezes. (AP Photo/Centers for Disease Control and Prevention, Cynthia Goldsmith)

This undated image made available by the Centers for Disease Control and Prevention on Feb. 4, 2015 shows an electron microscope image of a measles virus particle, center. Measles is considered one of the most infectious diseases known. The virus is spread through the air when someone infected coughs or sneezes. (AP Photo/Centers for Disease Control and Prevention, Cynthia Goldsmith)

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