M
Machado-Joseph Disease  
Mad Cow Disease (Bovine Spongiform Encephalopathy, or BSE)
Malaria    
Mammograms
Marburg Hemorrhagic Fever
Marine toxins (Causes of foodborne illness)
M.A.S.T.E.R. (antimicrobial susceptibility testing educational resources)
Maternal Health
Measles
Megalencephaly  
Melioidosis (Burkholderia pseudomallei)  Melkersson-Rosenthal Syndrome 
Meningitis
   Bacterial
   Viral (Aseptic)
Meningococcal Disease
Menkes Disease  
Men's Health
Mental Health
Mental retardation
Meralgia Paresthetica   
Metachromatic Leukodystrophy
Microcephaly  
Micronutrient Malnutrition
Microsporidiosis
Migration and Quarantine
Miller Fisher Syndrome   
Minority Health   
Mitochondrial Myopathies   
Mobility limitations
Mobius Syndrome  
Mold
Monkeypox
Monomelic Amyotrophy   
Mononucleosis
Mosquito-Borne Diseases
Motor Neuron Diseases 
Motor Vehicle-Related Injuries
Moyamoya Disease     
MRSA (Methicillin Resistant Staphylococcus aureus)
Mumps
Mucopolysaccharidoses 
Multifocal Motor Neuropathy       
Multi-Infarct Dementia  
Multiple Sclerosis            
Mumps
Muscular Atrophy, Spinal
Muscular Dystrophy   --
Mustard Gas (H) (Sulphur Mustard)
Myasthenia Gravis  
Myasthenia,Congenital  --
Mycobacterium avium Complex (MAC)
Mycoplasma pneumoniae Infection
Myelitis, Tranverse
Myoclonus
Myoclonus Orthostatic Hypotension 
Myopathy   
Myopathy, Congenital  
Myotonia  
Myotonia Congenita