Dr. Kessler

Once inside, pick up the newspaper article on the couch. There's also a diary on the table nearby that you can pick up.

You can find a Secret File inside a box in the next small room as well as Dr. Kessler's Paper on Kuru.

Talk to Dr. Kessler to update the quest. You'll have to recover four reagents in the greenhouse. Head to the decontamination chamber and exit to greenhouse. The mutated scientists are grenadier-type zombies that can throw pieces of their flesh to you to deal damage. Ignore them for the meantime and go around the greenhouse until you find a red ladder. Climb it up to reach the upper ledges and kill them all. Loot all the reagents and head back to the lab.

Use the blood sampling machine and let the doctor run a test on your blood sample. Talk to him again to get the map and complete the mission.