from atlanta journal-constitution: A critical germ lab at the Centers for Disease Control and Prevention lost power last week because the agency had taken two backup generators out of service for upgrades, CDC officials said Friday. Their absence from a complex, centralized backup generator system created a power fluctuation when the system was activated during a July 11 power outage, causing the whole system to shut down, CDC spokesman Dave Daigle said. The problem is being fixed, he said. The backup power failure — the second in 13 months — is the type predicted years ago by some CDC engineers. And it has heightened concerns in Congress about lab safety at the Atlanta agency, which experiments on smallpox, Ebola, anthrax and other deadly germs.