CDC Yellow Book
- M. marinum infections
- Macacine herpesvirus 1 (B virus)
- Macau SAR (China)
- Macedonia
- Machu Picchu
- macular lesions
- maculatum infection [table]
- Madagascar
- Madariaga virus
- Madeira Islands (Portugal)
- magnet therapy
- Malawi
- Maldives
- Malta
- Marangu route, up Kilimanjaro
- marijuana
- Marquesas Islands
- Marshall Islands
- Martinique (France)
- Masai Mara National Reserve
- MAT (microscopic agglutination test)
- mate de coca
- Mauritius
- Mayotte (France)
- mebendazole
- mediastinum, gas in
- Medicaid
- medical examination, of adopted child
- medical laboratorians
- Medicare beneficiaries
- Medications and Mothers' Milk
- Medigap plans
- Mediterranean spotted fever-like illness [table]
- mefloquine-resistant malaria
- melanomas
- menstruation
- meropenem
- methicillin-resistant Staphylococcus auerus
- metoclopramide
- metronidazole
- Micronesia, Federated States of
- microscopic agglutination test (MAT)
- military deployments
- miltefosine
- Milwaukee protocol
- Minas Gerais exanthematic typhus [table]
- missed doses of vaccines
- ML (mucosal leishmaniasis)
- modified varicella (break-through varicella)
- mohinga
- mold
- Monaco
- Mongolia
- mononucleosis syndrome [table]
- Montenegro
- Montserrat (UK)
- Moorea
- morning sickness
- Morocco
- Mount Everest
- MR vaccine
- MS (multiple sclerosis)
- mucosal leishmaniasis (ML)
- multidrug-resistant bacteria
- multiple sclerosis (MS)
- Murray Valley encephalitis
- muscular sarcocystosis
- myalgia, fever and [table]
- mycobacterial infections