Choose all of the responses that pertain to the relative burden of human infectious diseases in the world today:
a. noncommunicable disease causes the highest percentage of deaths at all income levels
b. deaths due to communicable diseases are highest in low income, developing countries
c. developed countries like the u. s. exhibit deaths only due to chronic disease
d. the infectious diseases that cause the most deaths worldwide and in the us are pneumonia and influenza
e. injuries are the lowest cause of death in all income categories
f. hiv is the most concerning infectious disease worldwide