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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Opportunistic infection
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Accession:HP:0031690 term browser browse the term
Definition:An infection that is caused by a pathogen that would generally not be able to cause an infection in a host with a normal immune system. Such pathogens take advantage of the opportunity, so to speak, that is provided by a weakened immune system.
Comment:Opportunistic infection are infections that occur more often or are more severe in people with weakened immune systems than in those with normal immune system functioning.

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the immune system 0
        Abnormality of immune system physiology 0
          Unusual infection 0
            Opportunistic infection 0
              Disseminated cryptosporidium infection 0
              Invasive parasitic infection 0
              Opportunistic bacterial infection + 0
              Opportunistic fungal infection + 0
              Opportunistic viral infection + 0
              Recurrent opportunistic infections 0
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