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Two popular food brands have recalled products contaminated by listeria. Blue Bell brand ice cream has been linked with 8 illnesses and 3 deaths. The U.S. Centers for Disease Control and Prevention (CDC) announced the outbreaks April 9. Also last week, Sabra said it had recalled 30,000 cases of classic hummus. The bacteria were found in several tubs of hummus in Michigan. No infections have been linked to hummus, state health officials said. The CDC said 3 people in Texas became ill after eating Blue Bell ice cream between 2011 and 2014. Five cases in Kansas occurred from January 2014 to January 2015. Three of the Kansas patients died. Blue Bell Creameries has closed a plant and recalled several products. An expert interviewed by HealthDay News said people can get sick 3 to 70 days after being exposed to listeria.

Blue Bell Creameries has removed all of its frozen dessert products from the market because of possible listeria contamination. The Texas-based company made the announcement April 20. Blue Bell also reported results of recent tests. They found Listeria monocytogenes bacteria in some cartons of chocolate-chip cookie dough ice cream made on two dates in March. This means that listeria has been found in products made by several different plants. That’s why Blue Bell decided to pull all frozen desserts. People should return any products they have for a full refund. Ten cases of listeria infection dating back to 2011 have been linked to Blue Bell ice cream products. The most recent were this year. Three people have died. Listeria symptoms include nausea, vomiting and stomachache. Symptoms can start 3 to 70 days after exposure. Severe cases are rare.

Short people may be more likely to have heart disease, and that could be linked to their genes, a new study finds. The study looked at genetic data and height for more than 18,000 adults. Researchers found that those who were shorter and had genes related to shorter height were more likely to have heart (coronary artery) disease. Heart-disease risk increased about 13.5% for every 2½ inches of height difference. People who were shorter also were more likely to have high levels of LDL cholesterol and triglycerides. Both of these blood fats are linked with a higher risk of heart disease. But researchers found that having higher levels of blood fats could explain only about one-third of the greater risk in shorter people. One detailed analysis suggested that the higher risk with shorter height may exist in men only.

Switching diets may make a big difference in African Americans’ risk of colon cancer, a small study suggests. African Americans have a higher risk of colorectal cancer than whites. But rural African blacks have an extremely low risk. The new study included 20 African Americans and 20 blacks from rural South Africa. Researchers gave everyone colonoscopies. They removed polyps that could develop into cancers from 9 Americans. None of the Africans had polyps. Researchers also looked at inflammation, chemical activity and bacteria in the colon. What they found was different between the 2 groups. The Americans’ results have been linked in other research with a higher risk of colon cancer. The Africans showed lower risk. Researchers had the groups switch diets for 2 weeks. The African Americans ate the Africans’ normal high-fiber, low-fat diet.

New guidelines may help decide who should take medicine after a first seizure. About 10% of people in the world have at least 1 seizure in a lifetime. But the risk of having more seizures varies. The updated guidelines come from the American Academy of Neurology and the American Epilepsy Society. They outline how to estimate the risk that someone will have another seizure. Taking anti-epileptic drugs can help prevent seizures, but they have side effects. After a first seizure, the chance of having another one is highest in the next 2 years. The chance is 21% to 45%, the guidelines say. Risk varies based on each person’s medical history and test results. Two groups have the highest risk of another seizure, the guidelines say. They include people who have had another brain problem, such as a stroke or head injury, and those whose test results show signs of epilepsy.

Obesity appears to increase the risk of aggressive prostate cancer, especially in black men, a new study finds. The study included nearly 3,400 black men and almost 22,700 white men. When the study began, they were at least 55 years old and did not have prostate cancer. In the next 5½ years, blacks were 58% more likely to develop prostate cancer than whites. The increase in risk was greatly affected by weight. Among men of normal weight, blacks had a 28% higher risk of prostate cancer than white men. For very obese black men, the risk was 103% higher. And very obese black men were 81% more likely to have aggressive prostate cancer than black men of normal weight. This type of prostate cancer grows quickly. The link between obesity and prostate cancer was not as strong for white men.