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Use of a real-time PCR to explore the intensity of Plasmodium spp. infections in native, endemic and introduced New Zealand birds.

Authors
  • Sijbranda, D C1
  • Gartrell, B D1
  • Grange, Z L1
  • Howe, L1
  • 1 Institute of Veterinary, Animal and Biomedical Sciences,Massey University,Private Bag 11 222,Palmerston North 4442,New Zealand. , (New Zealand)
Type
Published Article
Journal
Parasitology
Publication Date
Nov 01, 2017
Volume
144
Issue
13
Pages
1743–1751
Identifiers
DOI: 10.1017/S0031182017000919
PMID: 28691648
Source
Medline
Keywords
License
Unknown

Abstract

Avian malaria, caused by Plasmodium spp., is an emerging disease in New Zealand (NZ). To detect Plasmodium spp. infection and quantify parasite load in NZ birds, a real-time polymerase chain reaction (PCR) (qPCR) protocol was used and compared with a nested PCR (nPCR) assay. A total of 202 blood samples from 14 bird species with known nPCR results were tested. The qPCR prevalences for introduced, native and endemic species groups were 70, 11 and 21%, respectively, with a sensitivity and specificity of 96·7 and 98%, respectively, for the qPCR, while a sensitivity and specificity of 80·9 and 85·4% were determined for the nPCR. The qPCR appeared to be more sensitive in detecting lower levels of parasitaemia. The mean parasite load was significantly higher in introduced bird species (2245 parasites per 10 000 erythrocytes) compared with endemic species (31·5 parasites per 10 000 erythrocytes). In NZ robins (Petroica longipes), a significantly lower packed cell volume was found in birds that were positive for Plasmodium spp. compared with birds that were negative. Our data suggest that introduced bird species, such as blackbirds (Turdus merula), have a higher tolerance for circulating parasite stages of Plasmodium spp., indicating that introduced species are an important reservoir of avian malaria due to a high infection prevalence and parasite load.

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