| VIRUS | Half a dozen Russians contract an infectious disease (5) |
| MUMPS | Name an infectious viral disease characterised by swelling of the salivary glands (5) |
| POLIO | An infectious viral disease from el-cheapo lions |
| MANGE | An infectious skin disorder mainly affecting domestic animals (5) |
| VIRAL | Caused by an infectious agent (5) |
| EBOLA | River in the Democratic Republic of the Congo after which an infectious virus is named. (5) |
| SCARLETFEVER | An infectious disease characterised by a high temperature, a strawberrycoloured tongue and a rash (7,5) |
| SAMBA | Dance music with an infectious beat |
| ARTICLE | A clause of the Creed or of a contract; an item of business; the adjective "the"; a feature, piece, report or other journalistic composition; or, an object, thingamy or whatsit (7) |
| GERMANMEASLES | Rubella, an infectious disease with a pink rash (6,7) |
| IMMUNITY | Herd ___ refers to a population's ability to resist an infectious disease |
| GLANDULARFEVER | Frugal lad never treated an infectious disease (9,5) |
| MALARIA | An infectious disease caused by the bite of an infected mosquito (7) |
| EPIDEMIC | Widespread occurrence of an infectious disease in a community (8) |
| VACCINE | A substance used to stimulate immunity to an infectious disease (7) |
| PANDEMIC | A widespread occurrence of an infectious disease around the world (8) |
| CONTACT | Neologism for the process of identifying those who have been near a person with an infectious disease, included in the OED in 2020 (7,7) |
| ISOLATEDCASE | Just one instance of an infectious disease? (8,4) |
| PATHOGEN | Agent in an infectious disease thriller film |
| INCUBATE | Developing an infectious disease before symptoms appear (8) |
