Questions with the keyword 'disease'

• Why does injecting a small amount of a disease into a person help prevent it? by momochocoluv1 to Helen Comments: (No comments so far )
• what was the first disease that appeaered on this planet? by koonertwh to David, Helen, Ian, rhysphillips, Sarah Comments: (So far, one comment )
• What else can be done to prevent TB? by 07hughesroi to Helen Comments: (No comments so far )