Publications

hierarchical genetic structure and gene flow in three sympatric species of amazonian rodents.	the population genetic structure of three species of amazonian rodents (oligoryzomys microtis, oryzomys capito, and mesomys hispidus) is examined for mtdna sequence haplotypes of the cytochrome b gene by hierarchical analysis of variance and gene flow estimates based on fixation indices (nst) and coalescence methods. species samples are from the same localities along 1000 km of the rio juruá in western amazonian brazil, but each species differs in important life history traits such as population ...	1996	8673269
rio mamore virus: genetic characterization of a newly recognized hantavirus of the pygmy rice rat, oligoryzomys microtis, from bolivia.	human hantavirus disease occurs throughout much of south america. the rodent hosts and the specific etiologic agent(s) are largely unknown, but many reported cases occurred within the habitation ranges of oryzomine rodents (rice rats). we have identified a genetically novel hantavirus (rio mamore virus [rm]) of the pygmy rice rat oligoryzomys microtis in bolivia. the complete sequence of the small (s) genome and the partial sequence of the medium (m) genome are described. this virus is closely r ...	1997	9311652
isolation and genetic characterization of a hantavirus (bunyaviridae: hantavirus) from a rodent, oligoryzomys microtis (muridae), collected in northeastern peru.	this paper describes the isolation and partial genetic characterization of a hantavirus from a pygmy rice rat, oligoryzomys microtis, collected within the urban area of iquitos, loreto department, peru. the virus, designated htn-007, exhibited the highest degree of genetic similarity to rio mamore virus, which was originally described from the same rodent species in eastern bolivia. comparison of small and medium segment nucleotide sequence data from htn-007 and rio mamore virus revealed 87% and ...	1999	10432063
comparative chromosome banding of two south-american species of rice rats of the genus oligoryzomys (rodentia, sigmodontinae).	comparative analysis of g- and c-banding patterns in two species of pygmy rice rats, namely oligoryzomys microtis from peru (ucayali and loreto departments) and o. flavescens from bolivia (tarija department) established that the diploid number of the former species is 64 (nfa = 66), whereas, in the latter, it varies between 64 and 66 (nfa = 66-68) due to the presence of 0-2 heterochromatic supernumerary or b chromosomes. the g-banding pattern of the euchromatic part of their karyotypes is simila ...	1999	10598571
hantavirus pulmonary syndrome in central bolivia: relationships between reservoir hosts, habitats, and viral genotypes.	in august 2002, two cases of hantavirus pulmonary syndrome (hps) were confirmed in mineros and concepcion, within the santa cruz department of bolivia. extensive alteration of the native ecosystem, from dense forest to pasture or sugarcane, had occurred in both regions. an ecologic assessment of reservoir species associated with the human disease identified a single hantavirus antibody-positive oligoryzomys microtis from mineros and three hantavirus antibody-positive calomys callosus from concep ...	2005	15728866
newly recognized hantaviruses associated with hantavirus pulmonary syndrome in northern brazil: partial genetic characterization of viruses and serologic implication of likely reservoirs.	following the occurrence of the first laboratory-confirmed cases of hantavirus pulmonary syndrome (hps) in maranhao state, brazil, rodents were trapped and rodent materials screened by elisa for antibodies to sin nombre and andes hantaviruses. antibody-positive samples were tested by rt-pcr, amplified products were sequenced, and phylogenetic trees were constructed for comparison with known hantaviruses. from 104 rodent blood samples collected (40 bolomys lasiurus, 52 holochilus sciureus, 12 oli ...	2005	15815145
geographical range of rio mamoré virus (family bunyaviridae, genus hantavirus) in association with the small-eared pygmy rice rat (oligoryzomys microtis).	hantavirus htn.007 was originally isolated from a small-eared pygmy rice rat (oligoryzomys microtis) captured in northeastern peru. the results of analyses of nucleotide and amino acid sequence data in this study indicated that htn.007 is a strain of rio mamoré virus (riomv) which is enzootic in small-eared pygmy rice rat populations in bolivia. as such, the results of this study extend our knowledge of the geographical range of riomv and support the notion that the small-eared pygmy rice rat is ...	2010	20687859
hantavirus pulmonary syndrome in santa cruz, bolivia: outbreak investigation and antibody prevalence study.	we report the results of an investigation of a small outbreak of hantavirus pulmonary syndrome in 2002 in the department of santa cruz, bolivia, where the disease had not previously been reported. two cases were initially reported. the first case was a physician infected with laguna negra virus during a weekend visit to his ranch. four other persons living on the ranch were igm antibody-positive, two of whom were symptomatic for mild hantavirus pulmonary syndrome. the second case was a migrant s ...	2012	23094116
serologic evidence for human hantavirus infection in peru.	while human illness associated with hantavirus infection has been documented in many countries of south america, evidence for hantavirus transmission in peru has been limited to the isolation of rio mamore virus from a pigmy mouse rat (oligoryzomys microtis) in the amazon city of iquitos. to address the possibility of human hantavirus exposure in the region, we screened febrile patients reporting to health clinics in iquitos from 2007 to 2010 for serological evidence of recent hantavirus infecti ...	2012	22616720
native rodent species are unlikely sources of infection for leishmania (viannia) braziliensis along the transoceanic highway in madre de dios, peru.	an estimated 2.3 million disability-adjusted life years are lost globally from leishmaniasis. in peru's amazon region, the department of madre de dios (mdd) rises above the rest of the country in terms of the annual incidence rates of human leishmaniasis. leishmania (viannia) braziliensis is the species most frequently responsible for the form of disease that results in tissue destruction of the nose and mouth. however, essentially nothing is known regarding the reservoirs of this vector-borne, ...	2014	25062033
mice on menu: opportunistic feeding behaviour of the amazonian silver arowana osteoglossum bicirrhosum.	two silver arowana, osteoglossum bicirrhosum, one male (49.5 cm standard length, ls ) and one female (52.5 cm ls ) that had fed on small-eared colilargo or small-eared pygmy rice rat oligoryzomys microtis, were sampled during the rising water period in the brazilian amazon. the identified prey were 6 and 8 cm long and occupied the entire stomachs of both individuals. this opportunistic feeding behaviour appears to be a strategy for this fish to acquire nutrients during times when its usual aquat ...	2018	29882278
mice on menu: opportunistic feeding behaviour of the amazonian silver arowana osteoglossum bicirrhosum.	two silver arowana, osteoglossum bicirrhosum, one male (49.5 cm standard length, ls ) and one female (52.5 cm ls ) that had fed on small-eared colilargo or small-eared pygmy rice rat oligoryzomys microtis, were sampled during the rising water period in the brazilian amazon. the identified prey were 6 and 8 cm long and occupied the entire stomachs of both individuals. this opportunistic feeding behaviour appears to be a strategy for this fish to acquire nutrients during times when its usual aquat ...	2018	29934944