Cow (IMAGE) Penn State Caption Researchers have demonstrated that a vaccine for tuberculosis currently used in humans significantly reduces infectiousness of vaccinated livestock, improving prospects for elimination and control. Credit Vivek Kapur, Penn State Usage Restrictions Educational use only License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.