‘Cure’ is a bit of a tricky word to use, but to get rid of more than one disease causing organism is possible. Some broad spectrum antibiotics kill a variety of different types of bacteria, so if someone was co-infected the antibiotic would kill or ‘cure’ both types of bacteria if they were susceptible to the drug.
Also, there are vaccines such as the MMR vaccine- this 3 in 1 vaccines protects you against measles, mumps, and rubella (three common childhood diseases) all in one go!
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