| Country | Major infectious diseases |
| Nauru | void |
| Navassa Island | void |
| Nepal | degree of risk: intermediate food or waterborne diseases: bacterial diarrhea, hepatitis A, and typhoid fever vectorborne disease: Japanese encephalitis and malaria (2008) |
| Netherlands | void |
| Netherlands Antilles | void |
| New Caledonia | void |
| New Zealand | void |
| Nicaragua | degree of risk: intermediate food or waterborne diseases: bacterial diarrhea, hepatitis A, and typhoid fever vectorborne disease: dengue fever and malaria water contact disease: leptospirosis (2008) |
| Niger | degree of risk: very high food or waterborne diseases: bacterial and protozoal diarrhea, hepatitis A, and typhoid fever vectorborne disease: malaria respiratory disease: meningococcal meningitis note: highly pathogenic H5N1 avian influenza has been identified in this country; it poses a negligible risk with extremely rare cases possible among US citizens who have close contact with birds (2008) |
| Nigeria | degree of risk: very high food or waterborne diseases: bacterial and protozoal diarrhea, hepatitis A, and typhoid fever vectorborne disease: malaria and yellow fever respiratory disease: meningococcal meningitis aerosolized dust or soil contact disease: one of the most highly endemic areas for Lassa fever water contact disease: leptospirosis and shistosomiasis note: highly pathogenic H5N1 avian influenza has been identified in this country; it poses a negligible risk with extremely rare cases possible among US citizens who have close contact with birds (2008) |
| Niue | void |
| Norfolk Island | void |
| Northern Mariana Islands | void |
| Norway | void |
| Oman | void |
| Pacific Ocean | void |
| Pakistan | degree of risk: high food or waterborne diseases: bacterial diarrhea, hepatitis A and E, and typhoid fever vectorborne diseases: dengue fever and malaria animal contact disease: rabies note: highly pathogenic H5N1 avian influenza has been identified in this country; it poses a negligible risk with extremely rare cases possible among US citizens who have close contact with birds (2008) |
| Palau | void |
| Panama | degree of risk: intermediate food or waterborne diseases: bacterial diarrhea and hepatitis A vectorborne disease: dengue fever and malaria water contact disease: leptospirosis (2008) |
| Papua New Guinea | degree of risk: very high food or waterborne diseases: bacterial diarrhea, hepatitis A, and typhoid fever vectorborne diseases: dengue fever and malaria (2008) |
| Paracel Islands | void |
| Paraguay | degree of risk: intermediate food or waterborne diseases: bacterial diarrhea, hepatitis A, and typhoid fever vectorborne disease: dengue fever and malaria (2008) |
| Peru | degree of risk: very high food or waterborne diseases: bacterial, hepatitis A, and typhoid fever vectorborne disease: dengue fever, malaria, Oroya fever, and yellow fever water contact disease: leptospirosis (2008) |
| Philippines | degree of risk: high food or waterborne diseases: bacterial diarrhea, hepatitis A, and typhoid fever vectorborne diseases: dengue fever and malaria (2008) |
| Pitcairn Islands | void |
| Poland | degree of risk: intermediate food or waterborne diseases: bacterial diarrhea vectorborne disease: tickborne encephalitis note: highly pathogenic H5N1 avian influenza has been identified in this country; it poses a negligible risk with extremely rare cases possible among US citizens who have close contact with birds (2008) |
| Portugal | void |
| Puerto Rico | void |
| Qatar | void |
| Romania | void |
| Russia | degree of risk: intermediate food or waterborne diseases: bacterial diarrhea and hepatitis A vectorborne disease: Crimean Congo hemorrhagic fever and tickborne encephalitis note: highly pathogenic H5N1 avian influenza has been identified in this country; it poses a negligible risk with extremely rare cases possible among US citizens who have close contact with birds (2008) |