New estimates show 25% to 50% of virus carriers can infect others blindly. It’s prompting US officials to rethink who should wear masks. No Comments Uncategorized Tracking the outbreak | Alerts | Newsletter | Podcast | Q&A | Timeline Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to print (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on WhatsApp (Opens in new window)