1 pointFor a highly credible discussion of N95 reuse, see: https://www.cdc.gov/niosh/topics/hcwcontrols/recommendedguidanceextuse.html In quick summary, as long as the N95 "maintains its structural and functional integrity and the filter material is not physically damaged or soiled," it can be reused. When reusing, wash your hands before putting on a respirator and wash them before & after taking it off. The article notes that ~99.8% of pathogens were trapped on the filters after handling or a simulated sneeze. Hence, even if you don't wash your hands after touching a contaminated filter, the likelihood that you will transfer pathogens is very very low.
1 pointIn terms of WHO not criticizing China, I think this is appropriate. As others have noted, no one has a perfect plan on what to do. Tony Abbott, Australia's Health Minister said it well at a Pandemic flu conference in 25 Oct 2005: "In the absence of a pandemic, almost any preparation will smack of alarmism. If a pandemic does break out, nothing that's been done will be enough." This is a challenge for China and likely any of our countries. The reality that all of our countries should be taking draconian measures (i.e., before the epidemic gets started). However, this would likely "smack of alarmism," so we'll likely delay until things get moving. Criticism of China's early efforts could likely be directed at each of our countries now (few in China imagined it would get this bad and few in my country of the US likely think this of the US as well). We only know after-the-fact if we were "too alarmist" or not enough alarmist.
1 pointI can't help thinking though about the usual headlines every year about the 'New Year migration' 'half-a-billion people on the move' etc. The lockdown may be unprecedented, and not normally helpful in other places in the past, but the amount of movement through and around central China during the New Year holiday is surely unprecedented anywhere else in the world. I mean: perhaps the % of people who end up not travelling, because of the lockdown, will be considerably greater in this instance than at any other time of the year.