1. The course of typhus infection in cotton rats has been described, and a relationship between the dose administered and the time of death has been demonstrated. 2. Rather incomplete pathological studies indicated that typhus in the cotton rat is an acute infection primarily involving mesothelial tissue, and tissues of mesothelial origin. Depending somewhat upon the route of infection, rickett...

Using quantitative PCR analysis and DNA sequencing, we provide evidence for the presence of rat lungworm (Angiostrongylus cantonensis) in Oklahoma, USA, and identified a potentially novel rat host (Sigmodon hispidus). Our results indicate a geographic range expansion for this medically and ecologically relevant parasite in North America.

Individuals of a new species of trichostrongyloid nematode of the genus Vexillata were collected from the intestines of the coarse-haired pocket mouse Chaetodipus hispidus from eastern New Mexico. This new species possesses general features of the genus Vexillata but may be recognized as distinct from all other species by unique features of the dorsal ray of the caudal bursa and the synlophe.

To identify the role of avitaminosis E in the production of histological lesions and the distribution of an acid-fast pigment in the young cotton rat, weanling animals were maintained on a vitamin E deficient diet for 41 to 179 days. Since the pigment, lipofuscin, cannot be degraded by any cell, including the macrophage, it accumulates linearly with age of the animal and the length of the avita...

Many plants support symbiotic microbes, such as endophytic fungi, that can alter interactions with herbivores. Most endophyte research has focused on agronomically important species, with less known about the ecological roles of native endophytes in native plants. In particular, whether genetic variation among endophyte symbionts affects herbivores of plant hosts remains unresolved for most nat...

Resumen: Se colectaron babosas (Veronicellidae) en el Departamento de Morazán, Honduras. La digestión con jugo gástrico artificial mostró la presencia de larvas de tercer estadio morfológicamente semejantes a Angiostrongylus costaricensis. Se les inoculó en ratas (Sigmodon hispidus) con sonda gástrica. Cincuenta días después se obtuvieron los nemátodos adultos y se confirmó el diagnóstico. A pe...

PREMISE OF THE STUDY Primers were designed to produce short amplicons containing single-nucleotide polymorphisms (SNPs) in β-tubulin (tubB) and translation elongation factor 1-α (tefA) in Epichloë canadensis (Clavicipitaceae), an endophytic fungus of Elymus canadensis (Poaceae). METHODS AND RESULTS Primers to amplify regions of tubB and tefA containing suspected SNPs were designed and tested ...