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    How E. Coli in Food Makes People Sick

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    The bacteria sickens an estimated 265,000 Americans each year.Last week, federal officials announced recalls of ground beef and organic walnuts because they were potentially contaminated with E. coli bacteria that can make people sick.The recalls involve more than 16,000 pounds of ground beef distributed by Cargill Meat Solutions and sold at Wal-Mart stores in 11 states, as well as organic shelled walnuts sold in bulk in natural food and co-op stores in 19 states. So far, the recalled walnuts have been associated with 12 illnesses, including seven hospitalizations, in Washington State and California.No illnesses have been reported from the ground beef recall, although ground beef remains one of the most common sources of illnesses from these bacteria, which are responsible for an estimated 265,000 illnesses annually. Most of these, however, are not diagnosed or tracked by the Centers for Disease Control and Prevention because people often recover on their own without visiting a doctor, said Matthew Wise, chief of the C.D.C.’s Outbreak Response and Prevention Branch.Here’s what you need to know about E. coli to stay safe.Where You’ll Find the BacteriaThere are many different kinds of E. coli, and most of them are harmless to humans, said microbiologist Edward G. Dudley, director of the E. Coli Reference Center at Pennsylvania State University.Some types do, however, make people sick, he said. Those that most commonly cause illness in humans, known as Shiga toxin-producing E. coli, primarily reside in cow intestines, which is why they often contaminate ground beef. The E. coli implicated in the ongoing walnut and ground beef recalls are a type of Shiga toxin-producing E. coli.Because these bacteria eventually work their way out of animal intestines and into feces, they can also contaminate farm soil, which is why E. coli outbreaks are also often tied to produce, Dr. Dudley explained. They can also contaminate ponds, lakes and rivers.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      The Health Benefits of Getting Dirty

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      Scientists have long known that a little dirt can be good for you. Research has suggested that people who grow up on farms, for instance, have lower rates of Crohn’s disease, asthma and allergies, likely because of their exposure to a diverse array of microbes.In the 1970s, scientists even found a soil-dwelling bacterium, called Mycobacterium vaccae, that has an anti-inflammatory effect on our brains, possibly both lowering stress and improving our immune response to it.More recently, there’s been an explosion of interest in the human microbiome — with people taking probiotics, seeking food with live cultures and “rewilding” their microflora. At the same time, scientists have been discovering how broad a role dirt microbes can play in our mental and physical health.When we’re touching soil or even just out in nature, “we’re breathing in a tremendous amount of microbial diversity,” said Christopher A. Lowry, a professor of integrative physiology at the University of Colorado Boulder.A recent Finnish experiment found that children attending urban day cares where a native “forest floor” had been planted had both a stronger immune system and a healthier microbiome than those attending day cares with gravel yards — and continued to have beneficial gut and skin bacteria two years later.It’s not just good for kids; adults can also benefit from exposure to soil-dwelling microbes, Dr. Lowry said. So this spring, make a little time to go outside and get grimy.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      Bacteria That Cause Meningitis Are Spreading Again, C.D.C. Warns

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      The NewsFederal officials are warning health care providers to be on the lookout for invasive meningococcal disease, a rare but potentially deadly illness that has increased in prevalence in recent years and requires prompt treatment with antibiotics to prevent long-term disability or death.Colonies of Neisseria meningitidis bacteria, which cause meningococcal disease.Brodsky/CDC, via Associated PressBy the Numbers: A rising fatality rate.The illness is caused by infection with a bacterium called Neisseria meningitidis. Last year, 422 cases of invasive meningococcal disease were reported in the United States, the highest number since 2014, according to the Centers for Disease Control and Prevention.But as of Monday, 143 cases have been reported to the C.D.C. so far this year, 62 more than the number of cases reported last year during the same period.The illness is extremely dangerous. Even with appropriate treatment, 10 to 15 percent of patients who develop meningococcal disease will die. Many recent cases were caused by an unusual strain of N. meningitidis called ST-1466. This strain caused 17 deaths among 94 patients whose outcomes are known, a fatality rate of 18 percent.Survivors of meningococcal disease may be left with long-term disability, deafness, amputations or brain damage.The Mystery: What’s causing the outbreaks?A majority of people affected in the recent outbreaks were Black people and adults ages 30 to 60.Others who are susceptible to the infection include people living with H.I.V., who account for 15 percent of patients; individuals who have had their spleens removed; people with sickle cell disease; and patients with certain rare immune conditions.A meningitis vaccine that protects against four of six N. meningitidis types — including group Y, which includes ST-1466 — is recommended for adolescents as well as those with medical conditions like H.I.V. Most older adults have not received the vaccine.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More