Final answer:
Charles got sick even after taking all the precautions because the disease may have been transmitted through touch.
Step-by-step explanation:
Charles got sick even after taking all the precautions because the disease may have been transmitted through touch. Microbes can live on surfaces like doorknobs and can be transferred to hands.
If Charles touched his hands to his mouth, nose, or eyes, the microbes could enter his body and make him sick.
Even though he wore gloves, if he touched a contaminated surface and then touched his face without washing his hands, he could still have been exposed to the disease.