John Thomas
Thomas Veterinary Services, USA
Title: Antibiotic resistant, misuse, treatment failures or just plain professional ignorance
Biography
Biography: John Thomas
Abstract
The primary cause of this morbidity and mortality is pneumonia called bovine respiratory disease or shipping fever and this accounts for over 95% of sickness and death. Use of antimicrobials is based and directed by a combination of the following; Weight and length of feeding: To project a safe to slaughter dates, culture and sensitivity results: Do about 1000-2000 cultures a year from the following, autopsy samples of lung and mediastinal lymph nodes, Trans Tracheal and bronchial washes from clinically sick and pre-treated animals. The trend in the industry has been an increase in the metaphylaxis use of antibiotics sold as “One Shot” drugs (Protocol A) with a therapeutic blood and tissue levels greater than 24hours, where the practice was for shorter acting drugs given every other day for 3 treatments (Protocol B). Protocol drugs include macrolides fluoroquinolones third-generation cephalosporins and florfenicol. Protocol B drugs include penicillin third-generation cephalosporins (short-acting) and tetracyclines. The pathogenic bacterial are Mannheimia haemolytica, Pasteurella multocida, Histophilus somni and Mycoplasma bovis. During 2017 the industry experienced a devastating high incidence of atypical acute mycoplasma pneumonia which skewed things up.