Results of an oral rabies vaccination program for coyotes

OBJECTIVE: To determine effectiveness of large-scale distribution of an oral rabies vaccine contained in a palatable bait for halting expansion of a canine rabies epizootic in coyotes (Canis latrans). DESIGN: Prospective study. ANIMALS: 98 coyotes during prevaccination surveillance and 449 coyotes and 60 other wild animals during postvaccination surveillance. PROCEDURE: A vaccinia recombinant oral rabies vaccine was inserted into an edible bait for coyotes that also contained tetracycline as a biomarker. Vaccine units were then distributed via aircraft, using automated distribution equipment and flight plans developed by incorporating global positioning system equipment. The target area was along the northern edge of an area that had an epizootic of canine rabies. This area was identified through previously conducted epidemiologic surveillance of rabies cases. During postvaccination surveillance, dental specimens were examined for biomarker evidence of bait acceptance, and serum samples were analyzed for rabies neutralizing antibodies. RESULTS: Samples from 449 coyotes were obtained during postvaccination surveillance. Seroconversion was detected in 39 of 96 (40.6%) coyotes that had evidence of tetracycline biomarker. Additionally, the number of rabies cases in the target area decreased, and expansion of the epizootic area ceased. CLINICAL IMPLICATIONS: Mass distribution of an oral rabies vaccine in a palatable bait is an effective means to halt expansion of a rabies epizootic involving coyotes.     

Compliance with supportive periodontal therapy

CONCLUSIONS: Bronchobiliary fistula is an in frequent manifestation of common bile duct obstruction. The slowly progressive narrowing of the common duct by the fibrosis of chronic pancreatitis is an even more rare mechanism of such fistula formation with only two cases having been reported previously. A third case of bronchobiliary fistula caused by chronic pancreatitis is presented and its successful management is discussed. BACKGROUND: A 54-yr-old male with known chronic pancreatitis presented with a cough productive of copious amounts of bile and with pulmonary infiltrates. METHODS: Diagnosis of bronchobiliary fistula was made based on HIDA scan and confirmed by operative cholangiogram. RESULTS: Successful correction of this fistula was accomplished by operative closure of the fistulous tract and diversion of the narrowed bile duct by hepaticojejunal bypass.     

Patients with ocular hypertension have abnormal point scotopic thresholds in the superior hemifield

PURPOSE: To compare light- and fully dark-adapted thresholds at loci within the central visual field in patients with ocular hypertension and glaucoma. METHODS: Eighteen patients with chronic open angle glaucoma, 13 patients with ocular hypertension, and 24 age-matched normals were studied. The Humphrey automated perimeter with the standard background illumination of 31.5 apostilbs was used to determine photopic thresholds at 18 loci within 20 degrees of fixation. Fully dark-adapted thresholds were measured at the same loci after 30 minutes of dark adaptation by automatic, static campimetry. RESULTS: The glaucoma group showed elevated scotopic thresholds. Scotopic defects also were found in a significantly higher proportion of patients with ocular hypertension than in normals. These scotopic defects were predominantly in the superior hemifield. CONCLUSIONS: Scotopic threshold campimetry may identify the subgroup of patients with ocular hypertension who progress to develop glaucomatous field loss identifiable by standard photopic and mesopic perimetry.     

Detection of DNA damage induced by human carcinogens in acellular assays: potential application for determining genotoxic mechanisms

Positive outcomes of in vitro genotoxicity tests may not always occur as a consequence of direct reaction of a compound or a metabolite with DNA. To follow-up positive responses in in vitro tests, we developed two supplemental, cell-free assays to examine the potential of compounds and metabolites to directly damage DNA. Calf thymus DNA was used as the target for the direct detection of adducts by 32P-postlabeling/TLC and electrochemical detection, and alkaline gel electrophoresis was used to detect single-strand breakage of bacteriophage lambda DNA. To show that these assays would detect damage from relevant compounds, we examined nine human carcinogens (aflatoxin B1, busulfan, chlorambucil, cyclophosphamide, diethylstilbestrol, melphalan, 2-naphthylamine, phenacetin and potassium chromate). Each of the nine compounds produced a positive result for one or both endpoints. Using multifraction contact-transfer TLC, we detected 32P-labeled DNA adducts produced by aflatoxin B1, chlorambucil, diethylstilbestrol, melphalan, 2-naphthylamine, and potassium chromate (plus hydrogen peroxide). Aflatoxin B1, diethylstilbestrol and 2-naphthylamine required metabolic activation (induced rat liver S9) to generate DNA adducts. Although potassium chromate alone induced a slight increase in the content of 8-hydroxydeoxyguanosine (a promutagenic adduct produced by reactive oxygen species), addition of hydrogen peroxide greatly increased 8-hydroxydeoxyguanosine levels. The damage to lambda DNA by each human carcinogen (or metabolites), except diethylstilbestrol, was sufficient to generate single-strand breaks after neutral thermal hydrolysis at 70 degrees C. Chromate was a weak inducer of DNA fragmentation, but adding hydrogen peroxide to the reaction mixtures dramatically increased the DNA strand breakage. Our data suggest that these non-routine, acellular tests for determining direct DNA damage may provide valuable mechanistic insight for positive responses in cell-based genetic toxicology tests.