| thermal and water source effects upon the stability of enteroviruses in surface freshwaters. | the long-term survival of three human enterovirus serotypes, coxsackievirus b3, echovirus 7, and poliovirus 1 was examined in samples of surface freshwater collected from five sites of physically different character. these were an artificial lake created by damming a creek, a small groundwater outlet pond, both a large- and a medium-sized river, and a small suburban creek. survival was studied at temperatures of -20, 1, and 22 degrees c. the average amount of viral inactivation was 6.5-7.0 log10 ... | 1989 | 2545321 |
| survival of indigenous enteric viruses during storage of waste water sludge samples. | the stability of indigenous enteric viruses in samples of settled primary and mixed-liquor activated sludges was studied at 2, 23, and -70 degrees c. changes of virus titer which occurred in these samples were followed during an 84-day observation period, with rates of change then calculated by least-squares regression. virus survival was found to be statistically dependent (p less than or equal to 0.05) upon storage temperature but not sludge solids content. based upon the observed rates of ina ... | 1986 | 3021311 |
| soiled disposable diapers: a potential source of viruses. | | 1974 | 4370880 |
| laboratory studies of epidemic strains of echovirus 9. | | 1971 | 4996500 |
| new electropositive filter for concentrating enteroviruses and noroviruses from large volumes of water. | the u.s. environmental protection agency's information collection rule requires the use of 1mds electropositive filters for concentrating enteric viruses from water, but unfortunately, these filters are not cost-effective for routine viral monitoring. in this study, an inexpensive electropositive cartridge filter, the nanoceram filter, was evaluated for its ability to concentrate enteroviruses and noroviruses from large volumes of water. seeded viruses were concentrated using the adsorption-elut ... | 2009 | 19218410 |
| stability of viruses in waste water sludge eluates. | the survival of indigenous enteric viruses in samples of unconcentrated and concentrated waste water sludge eluates, which had been prepared using a combination beef extract elution - organic flocculation concentration procedure, was studied at 2, 23, and -70 degrees c. changes of virus titer occurring in the samples were followed during an 84-day observation period, with rates of change then calculated by least-squares regression. virus survival in both types of eluates was statistically depend ... | 1986 | 3021312 |
| the clinical presentations of rocky mountain spotted fever. comments on recognition and management based on a study of 63 patients. | rocky mountain spotted fever continues to increase in the united states and the case-fatality ratio remains unchanged despite the availability of effective antibiotics. the apparent reason for the continuing deaths from this disease is the failure of physicians to consider the diagnosis in patients presenting with febrile exanthems in the late spring and summer months. a clinical diagnosis should be based on the history of tick exposure and the presence of fever and the typical exanthem. serolog ... | 1978 | 679582 |
| sewage worker's syndrome. | | 1977 | 67447 |
| risk of infection associated with a wastewater spray irrigation system used for farming. | the use of wastewater for agricultural purposes involves the potential risk of infection from microorganisms in the wastewater. the application of partially treated wastewater on farms has been reported in one study to be associated with human illness, but this has not been confirmed. in the present study, workers at a land application system involving low-pressure spray irrigation of corn fields with wastewater were followed through a growing season to determine if they had an increased risk of ... | 1984 | 6694008 |