| Country | Major infectious diseases |
| Greece | void |
| Greenland | void |
| Grenada | void |
| Guam | void |
| Guatemala | degree of risk: high
food or waterborne diseases: bacterial diarrhea, hepatitis A, and typhoid fever
vectorborne disease: dengue fever and malaria
water contact disease: leptospirosis (2009) |
| Guernsey | void |
| Guinea | degree of risk: very high
food or waterborne diseases: bacterial and protozoal diarrhea, hepatitis A, and typhoid fever
vectorborne diseases: malaria and yellow fever
water contact disease: schistosomiasis
animal contact disease: rabies
aerosolized dust or soil contact disease: Lassa fever (2009) |
| Guinea-Bissau | degree of risk: very high
food or waterborne diseases: bacterial and protozoal diarrhea, hepatitis A, and typhoid fever
vectorborne diseases: malaria and yellow fever
water contact disease: schistosomiasis
animal contact disease: rabies (2009) |
| Guyana | degree of risk: high
food or waterborne diseases: bacterial and protozoal diarrhea, hepatitis A, and typhoid fever
vectorborne diseases: dengue fever and malaria
water contact disease: leptospirosis (2009) |
| Haiti | degree of risk: high
food or waterborne diseases: bacterial and protozoal diarrhea, hepatitis A and E, and typhoid fever
vectorborne diseases: dengue fever and malaria
water contact disease: leptospirosis (2009) |
| Heard Island and McDonald Islands | void |
| Holy See (Vatican City) | void |
| Honduras | degree of risk: high
food or waterborne diseases: bacterial diarrhea, hepatitis A, and typhoid fever
vectorborne diseases: dengue fever and malaria
water contact disease: leptospirosis (2009) |
| Hong Kong | void |
| Hungary | degree of risk: intermediate
food or waterborne diseases: bacterial diarrhea and hepatitis A
vectorborne diseases: tickborne encephalitis (2009) |
| Iceland | void |
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