Read the passage from the supporting text "Disease Central" in When Birds Get Flu by John DiConsiglio. The CDC started in 1946 i
n Atlanta, Georgia. At first, the organization focused mainly on the control of malaria—which meant killing mosquitoes. Scientists at the center organized a huge effort to spray an insecticide called DDT on more than six million homes. And by 1949, malaria was no longer a serious health problem in the U.S. The author most likely includes this passage to imply that Dr. Dowell must be older and experienced, given the CDC’s age. Dr. Dowell will be successful, given the CDC’s history of success. Dr. Dowell will study malaria, given the CDC’s focus on malaria. Dr. Dowell is not used to working abroad, given the CDC’s location in the US.
I would say Both, in my opinion because I use grammar a lot and never put commas when addressing someone If it is or isn’t being directly addressing he she or they. You could do he she or they or He, She, or they. If that’s what you mean?