You can block it. The unit won't heat or cool that room anymore though. The return air does effect supply air temp. And heat pump efficiency. With a 60 degree return air temp, the heat pump is more efficient then with a 70 degree return air temp.
We are simply getting contaminated causing otherwise healthy folks to lose the function of their kidneys and for a senior citizen who is already suffering sarcopenia this can be a death sentence because of the complexities associated with Renal Failure.
During the puerperium, parturient women are particularly susceptible to serious infections of the genital tract and childbed fever remains one of the most important causes of maternal death. This chapter will deal with fevers and infections during pregnancy, rather than the puerperium. While attempts have been made to list the more important causes of fever in pregnancy (Tables 1, 2, 3), the lists are by no means complete. Infections in pregnancy may be viral, bacterial or protozoan, affecting both mother and fetus.