![]() The survey in each survey location is conducted every six months. The surveys are conducted in rodent-infested areas or places which are likely to have rodent problems, in particular areas bustling with human activities. The results also serve as reference for assessing the overall efficacy of rodent prevention and disinfestation work. Based on the RIR and its trend, the RIS can gauge the general situation of rodent infestation in individual survey locations and form the basis for devising anti-rodent measures. The RIS adopts a scientific and objective method in assessing the extensiveness of rodent infestation in the survey location. When RIRs of all survey locations are available, the Overall RIR could be compiled. When RIRs for all survey locations under a particular district are available, the District RIR could be compiled. The ratio of the baits gnawed by rodents to the number of baits collected from the survey location generates the Rodent Infestation Rate (RIR). Since 2000, FEHD has been conducting the Rodent Infestation Survey (RIS) regularly by setting baits in designated survey locations to monitor rodent infestation. Although Hong Kong does not have human plague transmission since the middle of 1920s, our Department would carry out flea and rodent disinfestation operation in places with Rat-flea Index greater than 1. It has been reported from World Health Organization (WHO) that a Rat-flea Index of greater than 1 represents an increased potential plague risk for human. Please click here for the latest information on rat-flea index of rat flea collected from the rat examined The number of rat flea collected from the rat examined per each rat examined gives Rat-flea Index (Number of rat flea collected from the rat examined/Total number of rat examined = Rat-flea Index). Our Department has carried out study on rat flea and rodent infestation survey to monitor the situation of flea and rodent infestation in 18 districts. ![]() Rodents provide the essential link in the spread of rodent-borne diseases which are of public health importance. Assist in planning of rodent disinfestation operation and long-term rodent prevention measures.Find out the rodent species, estimated rodent population, rodent harbourages, food attraction for the rodent and activity range of the rodent.Rodent Prevention and Control Rodent Survey usually transmitted to human through rat biting.transmitted by air-borne droplets and faecal particles of infected rodent under poor ventilation.a disease of rodents caused by Hantaan virus.Do not leave clothes in scrubby area or on grasses.Apply insect repellents to exposed skin surfaces.Avoid resting in scrubby area or on grasses.Wear long trousers and clothes with long sleeves.Personal Preventive Measures for Scrub Typhus While Hiking/Camping.accidental infections in man: campers, hikers. ![]() transmitted by mites amongst rodents in scrubby areas.a rickettsial disease transmitted by rickettsia-infected mites feeding on human through biting.larvae feed on rodents adults feed on dog as their host.a rickettsial disease transmitted by rickettsia-infected ticks feeding on human through biting.also possible by the inhalation of dust or ingestion of food contaminated with flea excreta.flea faeces are rubbed or scratched into the wound or abraded skin.a rickettsial disease transmitted by rat fleas.rat fleas feeding on a bacteria-infected rodent would transmit the disease to the next host (rat or human) through biting.a disease of rodents caused by the bacterium, Yersinia pestis.Some of the common rodent-borne diseases are: through direct contact with rodent excreta.by food or water contaminated by rodent excreta.through the ectoparasites of rat like fleas, ticks and mites.The causative agents could enter our body by four different ways: ![]() Rodents are carriers of viral, rickettsial and bacterial diseases.
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