title: Studies on the survival of Ascaris suum eggs under laboratory and simulated field conditions.
abstract: A series of four experiments was carried out to study the survival of Ascaris suum eggs: in a pig slurry unit on a farm, in the laboratory under anaerobic conditions and different relative humidities (rH), and under simulated field conditions. Survival of eggs in the pig slurry unit was 20% after four weeks and 0% after 16 weeks. Anaerobic conditions had only a minor influence on survival: after 12 weeks, more than 80% of the eggs could still develop. At high relative humidities (100% and 75%), survival was respectively 96% and 62% after 12 weeks. At 47.5% rH, survival dropped to 0% after 10 weeks and at 7.5% rH in 8 weeks. A. suum eggs kept in pig slurry under dry and sunny outdoor conditions survived for 2-4 weeks, whereas under wet and shady conditions, 90% of the eggs were still viable after 8 weeks.
authors.affiliation: DLO-Institute for Animal Science and Health, Department of Pathobiology and Epidemiology, Lelystad, Netherlands. c.p.h.gaasenbeek@id.dlo.nl
authors.forename: C P
authors.initials: CP
authors.lastname: Gaasenbeek
authors.forename: F H
authors.initials: FH
authors.lastname: Borgsteede
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D017165:Ascaris suum / Q000254:growth & development* / Q000502:physiology; D018556:Crops, Agricultural; D005260:Female; D006813:Humidity; D006863:Hydrogen-Ion Concentration; D008372:Manure / Q000469:parasitology*; D009426:Netherlands; D010063:Ovum / Q000254:growth & development / Q000502:physiology; D013552:Swine / Q000469:parasitology*; D013696:Temperature
chemical_list: D008372:Manure