Jose and sarah are running in the cross country meet. their skeletal and muscular systems work to move them through the course. as they run, they breathe faster and harder and their heart rate increases. this illustrates that body systems

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).