Co-infection with two species: Difference between revisions
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(Created page with "Mixed-species malaria infections are often not recognized or underestimated. In Asia, surveys usually report that <2% of infections are mixed, whereas therapeutic studies in vivax or falciparum malaria have demonstrated a high prevalence (up to 30%) of infection with the other malaria species during convalescence, suggesting covert co-infection. In epidemiological studies, a high prevalence of cryptic mixed-malaria species infection has been detected by sensitive PCR tec...") |
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Mixed-species malaria infections | {{DISPLAYTITLE:<span style="position: absolute; clip: rect(1px 1px 1px 1px); clip: rect(1px, 1px, 1px, 1px);">{{FULLPAGENAME}}</span>}} | ||
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'''Navigation'''</br> | |||
<span style="font-size:90%">[[MalariaETC Index|Main Malaria Index]]''</span></br> | |||
<span style="font-size:90%">>[[Rapid diagnostic tests (RDTs)|RDT main page]]''</span></br> | |||
<span style="font-size:90%">>>[[Interpretation guide: SINGLE BAND tests|Single Band Tests]]''</span></br> | |||
<span style="font-size:90%">>>>Current page: '''Co-infection with two species'''</span> | |||
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|colspan="1" style = "font-size:140%; color:black; background: FFFAFA"|<span style="color:black>'''Dual species infection'''</span> | |||
<span style="font-size:90%">Mixed-species malaria infections certainly occur. Their precise frequency will vary according to the case-mix in the area concerned.</br></br>In endemic areas where multiple malarial species circulate estimates of prevalence may be as high as 30%, but in other areas this is far lower and would often be regarded as forming fewer than 5% of infections.</span> | |||
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<span style="font-size:90%">Recogition by morphology requires the presence of parasite forms that have recognisable species-specific features for two separate species. This may sometimes be easy, but can be challenging when one species predominates. Some examples are shown below:</br></br></span> | |||
<gallery mode="nolines" widths=250px heights=250px> | |||
File:Dual1.jpg|<span style="font-size:90%"></span>|A|link={{filepath:Dual1.jpg}} | |||
File:Dual2.jpg|<span style="font-size:90%"></span>|B|link={{filepath:Dual2.jpg}} | |||
</gallery> | |||
<span style="font-size:90%">'''Image A''': two gametocytes in separate red cells. These clearly have different appearances - one has the elongated and curved form typical of ''P.falciparum'', while the second is "round" with visible round bametocytecytoplasmic dots and fimbriation of the red cell - appearances of ''P.ovale''.</br<</br>'''Image B''': a large parasite within the red cell is clearly seen and has the chacteristics of a microgametocyte of ''P.ovale'', but note also a small fine early "double dot" ring form of ''P.falciparum'' that is within the same erythocyte - an unusual "dual-parasite" erythrocyte!</span> | |||
Latest revision as of 13:30, 21 November 2024
Navigation
Main Malaria Index
>RDT main page
>>Single Band Tests
>>>Current page: Co-infection with two species
| Dual species infection
Recogition by morphology requires the presence of parasite forms that have recognisable species-specific features for two separate species. This may sometimes be easy, but can be challenging when one species predominates. Some examples are shown below:
Image A: two gametocytes in separate red cells. These clearly have different appearances - one has the elongated and curved form typical of P.falciparum, while the second is "round" with visible round bametocytecytoplasmic dots and fimbriation of the red cell - appearances of P.ovale.</br< |
