People can prevent the global spread of communicable diseases from affecting their community. Individuals can report to local officials about areas in their community that
the spread of these diseases, Public officials
can also do their part. They can modify
people who need to be vaccinated.

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).