https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-mask/art-20485449

˝ Some N95 masks, and even some cloth masks, have one-way valves that make them easier to breathe through. But because the valve releases unfiltered air when the wearer breathes out, this type of mask doesn't prevent the wearer from spreading the virus. For this reason, some places have banned them.˝

There is 95% chance that the wearer will be protected by wearing N95 mask, but it does not prevent the wearer from spreading the virus.

It reduces the chances of spreading or being spreaded to but it is never 100% fool proof.

N95 masks are not recommended for involved patients. Surgeon should wear protective mask and wearing with good air conditioner

Thanks for your support here.

Could you check this newly accepted paper https://www.frontiersin.org/articles/10.3389/fpubh.2020.594458/abstract

I think covid patients should wear masks other than n 95 to avoid spreading infection to others