![Shelby County Health on X: "Check your mask. If it has a vent or valve, it is not the kind of mask that prevents the spread of #COVID-19. Protect the people around Shelby County Health on X: "Check your mask. If it has a vent or valve, it is not the kind of mask that prevents the spread of #COVID-19. Protect the people around](https://pbs.twimg.com/media/EdxgsOiXkAE1KNk.png)
Shelby County Health on X: "Check your mask. If it has a vent or valve, it is not the kind of mask that prevents the spread of #COVID-19. Protect the people around
![Did you hear about a study that showed masks don't work for viruses? That's misinformation - oregonlive.com Did you hear about a study that showed masks don't work for viruses? That's misinformation - oregonlive.com](https://www.oregonlive.com/resizer/ZUzy7Jwwea8D8VvkSE3Bo85vWj8=/1280x0/smart/cloudfront-us-east-1.images.arcpublishing.com/advancelocal/T2ROAX5EX5F4TBFBU5GNRSOQA4.jpg)
Did you hear about a study that showed masks don't work for viruses? That's misinformation - oregonlive.com
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