Germany reported an outbreak of highly pathogenic H5N1 bird flu on a farm in the eastern region of Saxony near the border with the Czech Republic, the World Organisation for Animal Health (WOAH) said on Monday.

Dhillon is an instructor in the Division of Global Health Equity at Brigham and Women’s Hospital and Harvard Medical School. Karan is an infectious disease physician and epidemiologist at Stanford University. Srikrishna is founder of Patient Knowhow.

Seven people in contact with a patient hospitalized with bird flu also developed symptoms, the C.D.C. reported. Some are undergoing further tests.

The CDC said an investigation into a human H5N1 bird flu infection in Missouri has found four additional health care workers who fell ill after caring for the patient.

After a patient with bird flu was hospitalized last month, state and federal health officials first determined the patient may have infected one household member and two hospital workers. However, "Missouri has since identified four additional health care workers who later developed mild respiratory symptoms,

At least eight people may be infected with H5N1 bird flu in Missouri, marking the first cluster of the disease spreading between humans in the United States. The first case of a human contracting bird flu with no known animal contact happened in Missouri in August,

In what could be the first cases of bird flu spreading between humans in the United States, a group of potential H5N1 infections in Missouri has now grown to eight. However, state health officials are still awaiting antibody tests to confirm whether the H5N1 infection is growing,