News & Perspective

In other developments, Saudi Arabia reported 3 more cases, 1 of them fatal.

The agency says there's still no evidence H7N9 has gained capacity for sustained spread.

H5N8 has now been confirmed in 40 countries, and South Korean scientists shared genetic findings from a recent H5N6 isolate.

So far there's no sign that H7N9 epidemiology is changing for humans, but for poultry, the virus has become more deadly.

Analyses of samples from China and Taiwan hint at resistance to antiviral drugs.

The 61 new infections reported last week push the mainland's total to at least 419 cases.