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→Epidemiology
==Epidemiology==
==Epidemiology==
Infected chickens '''pass''''' A. galli' eggs in their '''faeces'''. The '''larvae develop inside the egg''' until they reach their '''infective stage (L3)''' within 10-20 days or more, depending on environmental temperature and humidity. The embryonated egg can survive a winter with moderate frost and remain infective in deep litter systems for years depending on the temperature, humidity, pH and ammonium concentration.
Infected chickens '''pass''''' A. galli'' eggs in their '''faeces'''. The '''larvae develop inside the egg''' until they reach their '''infective stage (L3)''' within 10-20 days or more, depending on environmental temperature and humidity. The embryonated egg can survive a winter with moderate frost and remain infective in deep litter systems for years depending on the temperature, humidity, pH and ammonium concentration.
''Ascaridia galli'' has a '''direct lifecycle''' and it is complete when a new host (another chicken) ingests the infective embryonated eggs (L3) from contaminated water or feed. Three layers around the egg protect the larvae until it reaches the duodenum/ jejunum, where they hatch within 24hrs and enter the '''histotropic phase'''. They '''embed themselves into the mucosal layer of the intestine'''. The more eggs are present the longer the histotropic phase lasts. The length of this stage before the final maturation has been reported to be between 3 to 54 days (Herd and McNaught, 1975). The '''prepatent period''' varies from '''5 to 8 weeks'''.
''Ascaridia galli'' has a '''direct lifecycle''' and it is complete when a new host (another chicken) ingests the infective embryonated eggs (L3) from contaminated water or feed. Three layers around the egg protect the larvae until it reaches the duodenum/ jejunum, where they hatch within 24hrs and enter the '''histotropic phase'''. They '''embed themselves into the mucosal layer of the intestine'''. The more eggs are present the longer the histotropic phase lasts. The length of this stage before the final maturation has been reported to be between 3 to 54 days (Herd and McNaught, 1975). The '''prepatent period''' varies from '''5 to 8 weeks'''.