Identify all the ways that infections are spread? (Select all that apply)

A. They are found only in lymph nodes

Lymphatic vessels are widespread throughout the body and not limited to lymph nodes.

B. They have large pores and follow the venous pathway

Lymphatic vessels have large, permeable walls and generally follow alongside veins, draining interstitial fluid back to circulation.

C. They closely follow the path of the aorta

Lymphatics follow venous, not arterial (aorta), pathways.

D. They are found only in the spleen

The lymphatic system is distributed systemically, not restricted to the spleen.

A. Digestive system through contaminated feces:

This is the port of exit for diseases spread by the fecal-oral route (e.g., cholera, hepatitis A).

B. Respiratory system by coughing or sneezing:

Droplet infections (e.g., flu, COVID-19, common cold) are primarily spread through respiratory secretions expelled via coughing or sneezing.

C. Central nervous system by contaminated cerebral spinal fluid:

While CSF can carry infections (e.g., meningitis), it is not a common port of exit.

D. Urinary system by contaminated urine:

Urinary tract infections may be transmitted this way, but not typically through droplets.