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Warble Fly Treatment: Adverse Reactions

Lord McNair asked Her Majesty's Government:

Lord Lucas: Compulsory treatment for cattle infested with warble fly was introduced in 1978. Information on suspected adverse reactions to warble fly treatments is only available from 1st January 1985. In the period since then to 9th February 1996, a total of 34 adverse reaction reports involving animals, and 30 involving humans, have been received by the Veterinary Medicines Directorate.

Warble Fly: Compulsory Treatment

Lord McNair asked Her Majesty's Government:

Lord Lucas: The State Veterinary Service normally requires the treatment of all herds within a 3 km radius of a farm where there is serological or clinical evidence

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of warble fly infestation. In addition, all cattle imported into Great Britain are required to be treated for warble fly infestation within 24 hours of their arrival.

The table below lists those counties where compulsory 3 km treatment areas have been imposed during the last five years and the number of times. It should be noted, however, that serological evidence of infestation was detected on 215 premises in 1995 but, because there was no evidence of clinical disease, 3 km treatment areas were not imposed and compulsory treatment was restricted to individual herds:

19911992199319941995
Avon ----2----
Ayrshire ----2----
Bedfordshire ----1----
Cheshire ----8----
Cornwall ----1----
Cumbria --1--1--
Devon ----2----
Dorset ----1----
Dyfed ----1----
Gloucestershire ----1----
Hampshire ----2----
Hereford and Worcester--
--11--
Kent ----1----
Lancashire ----1----
Lothian ----1----
North Yorkshire --1------
Oxfordshire ----1----
Shropshire ----3----
Somerset ----5----
Staffordshire ----1----
West Sussex ----1----
Wiltshire ----31--
Total Nil2393Nil

The table below lists those products that are currently authorised, as opposed to recommended, for use against warble fly in cattle. Information on products which are no longer authorised is not readily available:

Product nameMarketing authorisation holderAuthorisation number Active ingredientIndications for use
Poron 20Young's Animal Health Ltd.PL 1447/4007PhosmetBeef cattle--not to be slaughtered for human consumption until
14 days after last treatment. Dairy cattle--should be treated immediately after milking or at least 6 hours before the next milking.
Oramee Drench for CattleMerck, Sharpe and Dohme Ltd.PL 0025/4045IvermectinBeef cattle--not to be slaughtered for human consumption within
21 days of last treatment. Dairy cattle--not to be used in cattle producing milk for human consumption or in dairy cows within 28 days prior to calving.
Ivomec Super Injection for CattleMerck,Sharpe and Dohme Ltd.PL 0025/4046IvermectinBeef cattle--not to be slaughtered for human consumption until
28 days after last treatment. Dairy cattle--not to be used in cattle producing milk for human consumption or in dairy cows within 28 days prior to calving.
Ivomec Pour On for CattleMerck, Sharpe and Dohme Ltd.PL 0025/4050IvermectinBeef cattle--not to be slaughtered for human consumption until
28 days after last treatment. Dairy cattle--not to be used in cattle producing milk for human consumption or in dairy cows within 28 days prior to calving.
Ivomec SR Bolus for CattleMerck, Sharpe and DohmePL 0025/4058IvermectinBeef cattle--not to be slaughtered for human consumption until
180 days after last administration; not for administration to cattle weighing less than 100 kg, or exceeding 400 kg, to preruminating calves or those of less than 12 weeks of age. Dairy cattle--not for use in cattle producing milk for human consumption; not to be administered to dairy heifers within 180 days of expected parturition.
DectomaxPfizer Ltd.PL 0057/4094DoramectinBeef cattle--not to be slaughtered for human consumption until
42 days after last treatment. Dairy cattle--not to be used in cows producing milk for human consumption or non-lactating dairy cows.
Enzec Injection for CattleMerck, Sharpe and Dohme Ltd.PL 0025/4060AbamectinBeef cattle--not to be slaughtered for human consumption until
42 days after last treatment. Dairy cattle--not to be used in cattle producing milk for human consumption.
Cydectin 1 per cent. Solution Injectable for CattleCyanamid (GB) Ltd.PL 0095/4059MoxidectinBeef cattle--not to be slaughtered for human consumption until
45 days after last treatment. Dairy cattle--not to be used in cattle producing milk for human consumption or within 60 days before parturition.
Panomec Injection for Cattle, Sheep and PigsMerck, Sharpe and Dohme Ltd.PL 0025/4071IvermectinBeef cattle--not to be slaughtered for human consumption within
35 days of last treatment. Dairy cattle--not to be used in cattle producing milk for human consumption or in dairy cows within 28 days prior to calving.
Ivomec Injection for CattleMSD AgvetPL 0025/4070IvermectinBeef cattle--not to be slaughtered for human consumption within
21 days of last treatment. Dairy cattle--not to be used in cattle producing milk for human consumption or in dairy cows within 28 days prior to calving.

Further details of these products are given in the 1995-96 Compendium of Data Sheets for Veterinary Products, published by the National Office of Animal Health Ltd.


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