Four men in King County have been diagnosed with a strain of HIV that is extremely hard to treat, and health officials are concerned it could spread further. At least two types of HIV drugs don't work against the strain, and another type has limited effectiveness, officials from Public Health — Seattle & King County said Thursday. "It's conceivable there can be more infections, and the gay community is at highest risk," said Dr. Bob Wood, the HIV/AIDS program director for Public Health. All the men were diagnosed with the strain as soon as they tested positive for the virus...