NYT Seven people in contact with a patient hospitalized with bird flu also developed symptoms, the C.D.C. reported. Some are undergoing further tests. A possible cluster of bird-flu infections in Missouri has grown to include eight people, in what may be the first examples of person-to-person transmission in the United States, the Centers for Disease Control and Prevention reported on Friday.
If confirmed, the cases in Missouri could indicate that the virus may have acquired the ability to infect people more easily. Worldwide, clusters of bird flu among people are extremely rare. Most cases have resulted from close contact with infected birds.
Health officials in Missouri initially identified a patient with bird flu who was hospitalized last month with unusual symptoms. The patient may have infected one household member and six health care workers, all of whom developed symptoms, according to the C.D.C.