Pathogens can be identified by bacterial culture and sensitivity of milk samples. This can be done by: A certified diagnostic laboratory. Results will be highly accurate and reliable, and will be able to detect rare strains and pathogens The veterinary practice laboratory. As a farm vet, you will have the results as soon as they are available, and don’t need to wait for the results from the lab. This means results are faster available for the farmer, too. On-farm testing. The major advantage is that most ‘cow-side tests’ are fast and practical. Although they suffice for the most common pathogens, they are less accurate and unable to detect specific strains. It is important to discuss with your farmer when and how to take milk samples.