Fox-news/science/wild-nature/viruses

• Researchers locked flu patients in a hotel with healthy adults — no one got sick - Groundbreaking flu transmission study reveals zero infections despite close contact between healthy volunteers and flu-positive students for two weeks.
• CDC reports first cruise norovirus outbreak this year, as nearly 90 people are infected - Nearly 90 passengers and crew fell ill with norovirus on Holland America's Rotterdam cruise ship during a Dec. 28-Jan. 9 voyage, according to CDC reports.
• Flu hospitalizations hit all-time weekly high in densely populated state, officials warn - New York reports record flu hospitalizations and cases, with a rise of nearly 1,000 in a single week. Health experts urge immediate vaccination as a new variant spreads.
• Flu by state: Where this season’s highly contagious variant is spreading the most - A highly contagious flu mutation called subclade K is sweeping the nation, raising health concerns about vaccine effectiveness this season. Here are the states at most risk.
• CDC warns Americans traveling to 4 countries over outbreak of untreatable mosquito disease - Global chikungunya outbreak prompts health warnings as cases surge across tropical regions. WHO reports 155 deaths from mosquito-transmitted virus.