Calls for testing to be tougher - farmers weekly

5 DECEMBER 1997 ------------------------- NO EVIDENCE OF TRANSFER OF ANTIBIOTIC RESISTANCE CLAIMS that antibiotic resistance has been transferred to humans via antibiotics present in food

are unfounded, scientists told a London conference on Monday. Christian Friis of Denmarks Royal Veterinary and Agricultural University, Copenhagen, told delegates that the lack of proof

meant there was no scientific evidence to back the Danish governments call for an EU ban on in-feed antibiotic use. Commenting on the resistance of Salmonella typhimurium DT104 in both

livestock and humans, Dr Friis suggested that the resistant bugs themselves could have transferred from livestock to farm or abattoir staff. "In-feed antibiotics, therefore, are not

necessarily to blame for the problem in human medicine, and so the argument for a ban is flawed," said Dr Friis. Nevertheless public pressure for a ban was growing in Europe, and growth

enhancers would be banned for pigs over 30kg in Denmark from Jan 1. British vet Paul McMullin told the conference, organised by NOAH, the representative body for animal health firms, that

bans like that were non-scientific and would curtail development of new antibiotics for animal use. Reduce competitiveness "If an EU ban was imposed it could seriously reduce the

competitiveness of the EU livestock industry on the world market because, with poorer performance, our production systems would carry higher costs. "It is unlikely that there would be a

worldwide ban on enhancers, and the Codex Alimentarius – the body which would assess whether the EU had grounds to ban imports of animals reared on enhancers – may not rule in our favour.

"This would allow cheaper imports of the very food we had banned, to flood the EU market and undercut EU prices," he said. But Peter Bennett, a microbiologist at Bristol

University, said that the greater the use of antibiotics, the greater the risk of resistant bacteria evolving. He said that while no-one could prove antibiotic resistance in humans was

linked to animal husbandry, excessive use of the drugs in any environment increased the risk of resistance. He argued that certain antibiotics, such as the fluoroquinolones which were still

highly effective in human medicine, should not be used for livestock but preserved for treating people. CALLS FOR TESTING TO BE TOUGHER ANTIBIOTICS for farm animals should undergo rigorous

tests for resistance development before being granted marketing approval, according to the World Health Organisation. Scientists meeting in Berlin recently said national governments should

set up appropriate legislation and enforcement powers. Poor practice They insisted that antibiotics should not be used to compensate for poor practice in animal production. They must be used

prudently and specifically. The advice has been welcomed by COMISA (the representative body of the worldwide animal health industry), though it claimed a successful resistance prevention

strategy could work only if the human health sector made simultaneous efforts.n