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Avian Influenza Infections in Nonmigrant Land Birds in Andean Peru

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Avian Influenza Infections in Nonmigrant Land Birds in Andean Peru DOI: 10.7589/2011-02-052 Journal of Wildlife Diseases, 48(4), 2012, pp. 910–917 # Wildlife Disease Association 2012 View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by UDORA - University of Derby Online Research Archive AVIAN INFLUENZA INFECTIONS IN NONMIGRANT LAND BIRDS IN ANDEAN PERU Richard A. J. Williams,1,2,6 Karen Segovia-Hinostroza,3 Bruno M. Ghersi,3,4 Victor Gonzaga,4 A. Townsend Peterson,1 and Joel M. Montgomery4,5 1 Biodiversity Institute, 1345 Jayhawk Blvd., University of Kansas, Lawrence, Kansas 66045, USA 2 Departamento de Zoologı´a y Antropologı´aFı´sica, Universidad Complutense de Madrid, C/Jose´ Antonio Novais, 2 Ciudad Universitaria, 28040 Madrid, Spain 3 Facultad de Mecicina Veterinaria de Universidad Nacional Mayor de San Marcos, Av. Circunvalacio´n Cdra. 28 San Borja, Lima, Peru 4 United States Naval Medical Research Center Detachment, Unit 6, Av. Venezuela Cdra. 36, Callao 2, Lima, Peru 5 Current address: International Emerging Infections Program, GDDER-KenyaCDC-KenyaMbagathi Rd, Off Mbagathi Way, PO Box 606, Village Market 00621, Nairobi, Kenya 6 Corresponding author (email: [email protected]) ABSTRACT: As part of ongoing surveillance for avian influenza viruses (AIV) in Peruvian birds, in June 2008, we sampled 600 land birds of 177 species, using real-time reverse-transcription PCR. We addressed the assumption that AIV prevalence is low or nil among land birds, a hypothesis that was not supported by the results—rather, we found AIV infections at relatively high prevalences in birds of the orders Apodiformes (hummingbirds) and Passeriformes (songbirds). Surveillance programs for monitoring spread and identification of AIV should thus not focus solely on water birds. Key words: Avian influenza viruses, ecology, hummingbirds, land birds, Peru. INTRODUCTION host distribution and genotypes there is sparse (Spackman et al., 2007). To date, The emergence and hemispheric spread AIV has been detected in wild birds in of highly pathogenic avian influenza (HPAI) Argentina (Pereda et al., 2008; Alvarez et al., H5N1 over the past 13 yr led to renewed 2010), Bolivia (Spackman et al., 2007), surveillance for avian influenza viruses Brazil (Senne, 2007), Chile (Suarez et al., (AIV) and study of influenza ecology. Wild 2004), Peru (Ghersi et al., 2009), and the birds, particularly of the aquatic bird Caribbean (Douglas et al., 2007). Surveys in orders, Anseriformes (ducks and geese) North America have detected AIV in birds and Charadriiformes (shorebirds, gulls, and terns), are widely considered to be AIV that migrate between North and South reservoirs, particularly for low-pathogenic America (Hanson et al., 2008; Dusek et al., strains (Swayne and Suarez, 2000). As a 2009). Highly pathogenic influenza has result, surveillance for AIV (and particularly been detected once in South America: for HPAI H5N1) has emphasized surveil- H7N3 in poultry at Los Lagos, Chile lance in water birds (DeLiberto et al., 2009; (Suarez et al., 2004). Highly pathogenic Hesterberg et al., 2009). Despite the appar- avian influenza H5N1 has not been detect- ent association with water birds, however, ed in the Western Hemisphere. AIV (including HPAI H5N1) have been We conducted broad-scale influenza detected more broadly across class Aves surveillance among land birds to assess (Peterson et al., 2008; Hesterberg et al., the distribution of AIV strains among land 2009; Cumming et al., 2012; Thinh et al., birds in Peru. Our goal was to produce a 2012), although some studies have shown baseline understanding of AIV prevalence 0% prevalence in land birds (Munster et al., before the annual influx of boreal migrant 2007). Nonetheless, known HPAI H5N1 species and any AIV that they might hosts are diverse, and land birds may play an introduce into the environment. Ours is important transmission role that is poorly the first broad-scale analysis of AIV distri- characterized (Kou et al., 2009). bution in South American land birds; to our Given the limited surveillance of South knowledge, we document the first detec- American wild birds, information on AIV tion of influenza in hummingbirds (family 910 WILLIAMS ET AL.—AVIAN INFLUENZA INFECTIONS IN LAND BIRDS, PERU 911 Trochilidae), and indeed in all avian host species found positive in this study. METHODS Field methods In June 2008, we sampled birds from two, mostly forested, Andean sites in Ayacucho Department, Peru, within 3 km of the towns of Ccano (12.785uS, 73.995uW) and Tutumbaro (12.733uS, 73.956uW), at elevations of 2,800–3,100 m and 1,800– 2,000 m, respectively (Fig. 1). Ccano is best characterized as covered by anthropogeni- cally modified, high-elevation cloud forest near treeline, whereas Tutumbaro presents mid-elevation cloud forest along a rushing Andean river. The two sites were separated by approximately 10 km of horizontal distance (considerably more by road). Sampling was conducted by mist netting and selective harvesting with shotguns; all individuals were apparently healthy when FIGURE 1. Northern Ayacucho, Peru, showing sampled. the two Andean sites from which land birds were collected and tested for influenza A virus infections. All birds sampled were euthanized Prevalences were 1.5% (n5265) in Ccano (triangle): before sampling, following protocols ap- and 1.2% (n5335) in Tutumbaro (diamond). Eleva- proved by the University of Kansas Insti- tion is indicated by shading; low elevation (light gray) tutional Animal Care and Use Committee. through to high elevation (dark gray)—see legend for Voucher specimens were prepared follow- detail. Ayacucho Department is highlighted in dark gray in the map of Peru (inset), and the Northern ing standard procedures for the identifica- Ayacucho study site is marked (square). tion of each sample and to document host sex, age, and condition. Voucher specimens although for larger birds, only a single lobe were deposited at the University of Kansas was preserved; for most birds, the entire Natural History Museum, Lawrence, Kan- intestine was sampled, although for larger sas, USA and Centro de Ornitologia y birds, only the anterior portion was pre- Biodiversidad (CORBIDI), Lima, Peru. served. Swabs and tissue samples were Ages of host individuals were determined collected immediately after euthanasia, by plumage characteristics, skull ossifica- frozen immediately in liquid N2 in cryo- tion, and dissection to determine presence tubes without any buffers, and maintained or absence of a bursa of Fabricius. at 280 C until testing; individuals collected All tissue sampling for virus testing was by shotgun were prepared as soon as done in field camps, to minimize capture- feasible postmortem, and kept as cool as to-processing time intervals; live-captured feasible in the interim. birds were maintained in cloth bags under RNA extraction and viral characterization cool conditions, and all were euthanized within 1 hr of capture. Oral pharyngeal and Each specimen type (oral pharyngeal cloacal swabs were collected by inserting a and cloacal swabs, intestine and lung tissue sterile cotton swab into the body orifice and samples) was pooled by species (maximum moving it across all surfaces inside. In six individuals/pool). Viral RNA from in- general, the entire lung was collected, testine and lung samples was extracted on 912 JOURNAL OF WILDLIFE DISEASES, VOL. 48, NO. 4, OCTOBER 2012 dry ice, or directly from swabs using the positive controls were used for all rRT-PCR QIAamp Viral RNA Mini Kit (Qiagen, testing, one human positive control, sup- Valencia, California, USA). Intestine and pliedintheCDCkit,andtheother lung tissue were homogenized using a high- obtained from a wild bird sample (Ghersi speed mechanical homogenizer (Mixer Mill et al., 2009). Primers for internal control MM300; Qiagen) for 1 min at 6,000 3 G, were unavailable. and viral RNA was extracted from the Samples determined positive by rRT- supernatant using the RNEasy Mini Kit PCR were processed for conventional PCR (Qiagen), with the minor modification that to amplify the matrix (M) and neuramini- 10 mLofb-mercaptoethanol was added to dase (NA) genes. The gene segments of 1 mL of buffer RLT before use. AIV were amplified by RT-PCR (Hoff- All samples were tested for influenza mann et al., 2001), using the primers Matrix gene by real-time reverse-transcrip- described therein. Briefly, 4 mLofRNA tion (rRT)-PCR using the US Centers for were transcribed into complementary Disease Control and Prevention (CDC) (c)DNA using avian myeloblastosis virus protocol released on 6 October 2009 reverse transcriptase (Promega, Madison, (revision 2) (www.who.int/csr/resources/ Wisconsin, USA) following the manufac- publications/swineflu/realtimeptpcr/en/ turer’s protocol, and 500 ng of Uni12 index.html). Invitrogen SuperScriptTMIII primer in a 30-mL reaction mix. The RT PlatinumH One-Step Quantitative Kit (In- reaction was performed at 42 C for 60 min; vitrogen Inc., Carlsbad, California, USA) 1 mL of the RT reaction was used for each was used for nucleic acid amplification, PCR reaction. The cDNA was amplified with a 20-mL reaction mixture containing: using the Expand High-Fidelity PCR 5.5 mL of nuclease-free water, 0.5 mLof system (Roche Diagnostics, Mannheim, each primer (20 nmol), probe, and kit- Germany) following manufacturer’s proto- supplied RT-PCR superscript enzyme, cols. The final concentration of Mg2+ ions 12.5 mL of kit-supplied RT-PCR master was 1.5 mM; primer concentrations were mix, and 5 mL of extracted viral RNA. The 1.5 mM. The first cycle consisted of 4 min at primers/probe for reverse transcription of 94 C, followed by 30 cycles with the viral RNA gene were: GAC CRA TCC TGT following conditions: 94 C for 20 sec, 58 C CAC CTC TGA C (forward); AGG GCA for 30 sec, and 72 C for 7 min, and a final TTY TGG ACA AAK CGT CTA (reverse); extension of 7 min at 72 C. FAM-TGC AGT CCT CGC TCA CTG After amplification, 10 mL of each GGC ACG-BHQ-1 (probe).
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