Lawmakers raising national security concerns and seeking to disconnect a major Chinese agency from U.S. pharmaceutical pursuits have rattled the biotech trade. The agency is deeply involved in development and manufacturing of essential therapies for most cancers, cystic fibrosis, H.I.V. and other diseases. The company reported outcomes of clinical trials involving Zepbound, an weight problems drug in the same class as Novo Nordisk’s Wegovy. New regimens in development, including once-weekly drugs and semiannual shots, could help control the virus in hard-to-reach populations. After a drawn-out global controversy over the coronavirus, the W.H.O. has updated its classification of how pathogens spread …