Don't bring it up again until they seem happier and assure them that its okay
The part that makes you yawn is the reticular
Answer:
Prior to more stringent blood safety measures and more sensitive tests, HIV from infected blood donors made its way into blood products. From the late 1970s to the mid-1980s, about half of all people with hemophilia became infected with HIV after using contaminated blood products.
In front of windows or even outside try staying away from open doors as well
Hope this helps, good luck ;)