Black line: cutoff above which samples are considered positive. may have acquired novel natural hosts in ecosystems where wild equids are common and are in close contact with other perissodactyls. == Introduction == The order Perissodactyla includes the three familiesEquidae,Rhinocertidae, andTapiridae. In theEquidae, nine herpesviruses have been identified, six of which are allocated to the subfamilyAlphaherpesvirinaeand three in the subfamilyGammaherpesvirinae. EHV-1 is an alphaherpesvirus and arguably Ozarelix one of the most important equine pathogens with a worldwide distribution in domestic horses (Equus ferus caballus) in Ozarelix which it causes respiratory disease, abortion, neonatal death and neurological disorders [1]. Infections with EHV-1 or closely related viruses have Rabbit polyclonal to RABAC1 been identified in other equids including zebras, domestic donkeys, and onagers [24]. Among non-equid perissodactyls, EHV-1 infection was reported in the Indian tapir (Tapirus indicus)and black rhinoceros(Diceros bicornis)[5,6]. EHV-1 antibodies were detected with a prevalence of 8.8% in African white (Ceratotherium simum) and black (Diceros bicornis) rhinoceroses [5]. EHV-9, the most recently discovered equine alphaherpesvirus, was first described in captive Thomsons gazelle (Gazelle thomsoni) in Japan that suffered from neurological symptoms and died [7], but was considered an accidental host [810]. Neither the natural host nor the complete host range of EHV-9 is known, but EHV-9 causes lethal disease in a number of different species under experimental conditions [3,7,1013]. Both EHV-1 Ozarelix and/or EHV-9 have been shown to infect varieties in captivity other than their known natural hosts, resulting in disease and fatality in non-perissodactyla varieties such as polar carry(Ursus maritimus), black carry(U.americanus), llamas(Lama glama), alpacas(Vicugna pacos), blackbuck(Antelopa cervicapra), Thomsons gazelle (Gazelle thomsoni) and giraffe (Giraffa camelopardalis) [7,12,1418]. A recombinant zebra-EHV-1/EHV-9 illness was reported inside a polar carry and in Indian rhinoceros (Rhinoceros unicornis), in both instances resulting in severe and ultimately fatal neurological symptoms [19,20]. The complete host range of EHV-1 and EHV-9 and whether you will find variations in captivity that potentially promote cross-species transmission remains unfamiliar. Serological studies carried out on free-living zebra populations (Equus burcelli) have demonstrated the presence of antibodies against EHV-1 and EHV-4 in South Africa and against EHV-9 in Tanzania where zebras share water sources and grazing areas with Thomsons gazelles and are thus frequently in close proximity to each other [3,21,22]. In Tanzania, the seroprevalence of EHV-1 and EHV-9 infections of 14% and 60%, respectively, was surveyed by serum neutralization test (SNT) [3]. However, equid alphaherpesviruses are very related genetically and antigenetically; thus, SNTs have poor discriminatory power for closely related viruses such as EHV-1, EHV-4 and EHV-9. Consequently, it is unlikely that SNTs allow discrimination between EHV-1 or EHV-9 antibodies [7,10]. To accurately distinguish between the different disease strains, a type-specific-gG-based enzyme-linked immunosorbent assay (ELISA) was developed for EHV-1- and EHV-4-specific antibodies [23]. ELISAs were also developed to discriminate between EHV-1 and EHV-4 using peptides [glycoprotein E (gE) for EHV-1 and glycoprotein G (gG) for EHV-4] [24,25]. However, assays to discriminate antibodies against EHV-1 and EHV-9 have not been developed. With this study we developed and applied a peptide-based ELISA to detect and differentiate between EHV-1- and EHV-9-specific antibodies in serum of different varieties. Seroprevalence for both viruses was identified from 428 serum samples collected from captive and wild animals. The objectives of the study were to determine the prevalence of EHV-1 and EHV-9 infections and specifically to determine the host range in the wild and to determine equid and non-equid reservoir varieties. == Materials and Methods == == Serum samples == Sera were collected from non-vaccinated captive (n = 277 samples from 43 zoos) and free ranging varieties (n = 151 samples, Tanzania and Namibia) (Table 1). EHV-9 positive serum collected from an experimentally infected rabbit [26] was used like a positive control as no infected horse serum was available. An EHV-9 bad horse (umbilical wire blood serum) [24] sample was used as a negative control. An EHV-1-positive control serum collected at day time 21 from an experimentally infected seronegative horse (horse a [24,27]) and EHV-1-bad control (umbilical wire blood serum) collected from equine neonates immediately after birth [24] were used as.