> a) reasonable grounds for worry by someone who studies epidemics What does this have to do with the accuracy of the headline? You're just appealing to author

> a) reasonable grounds for worry by someone who studies epidemics What does this have to do with the accuracy of the headline? You're just appealing to authority -- but the same authority figure says, in the same article, that the 2 cases in Cambodia may not even be an example of human-to-human transmission: > “So far, it is too early to know if it’s human-to-human transmission or exposure to the same environmental conditions,” Briand told a virtual press conference hosted in Geneva. The line you're quoting also explicitly says that the "worry" is general spread, not this particular example.