this is for my friendsthe last couple of days i have been acting like a dum a $ $, and i have been rude, and i'm just really sorryif u could forgive me that would be great, but i understand if u don't forgive me. And this is to my sis(Miley) i'm sorry for making u feel left out when i don't text uI'm sorry :(

What link in the chain of transmission is described in the paragraph? sarah has been eating and sleeping poorly. she was just diagnosed with pneumonia. tests showed the illness was caused by streptococcus pneumoniae. in the chain of transmission, sarah is the (blank) , and streptococcus pneumonia is the (blank).