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Flu symptoms can be more severe when you're pregnant, landing women in the hospital, threatening their lives and even leading to preterm birth or miscarriage. The virus is a risk to the woman and the baby. So, it's particularly important that people who are pregnant get the flu vaccine. And it's also important that the effects of those vaccines be studied in pregnant women. (Hersher, 9/25)

Infant and maternal tetanus was officially eliminated from the Americas this year, the Pan American Health Organization announced on Thursday. At one time, the infection killed about 10,000 newborns annually in the Western Hemisphere; tetanus still kills about 35,000 infants around the world. It was one of several significant global health advances, including new programs against malaria and H.I.V., announced last week in conjunction with the meeting of the United Nations General Assembly in New York. (McNeil, 9/22)

Mosquitoes are more than a spoiler of backyard barbecues. They threaten more than half the world’s population with their disease-spreading bites. In fact, mosquitoes are deadlier — by far — than sharks and snakes. They are the incubator and chief disseminator of malaria, dengue and yellow fevers, as well as newer scourges like the West Nile and Zika viruses. Their numbers explode with floods, hurricanes and climate change, allowing them to outnumber every animal on Earth during their peak breeding season. Public-health officials fret about them 24/7. (Healy, 9/22)

The state Health Department counts only 180 Zika infections in Florida so far in 2017, on track to come in well below the 1,456 cases reported all of last year. The vast majority are travel-related cases brought to Florida by people who came from somewhere else, like Zika hotbed areas in Central and South America or the Caribbean, already infected with the virus. (Griffin, 9/25)

The brain damage was so severe that scientists all but gasped.Aaron Hernandez, the former New England Patriots tight end who was convicted of murder, killed himself in prison in April at age 27. An autopsy revealed that he had brain injuries akin to those seen in afflicted former players in their 60s, researchers announced on Thursday. (Carey, 9/22)

The last “Saw” movie, released by Lionsgate in 2010, was advertised as “the final chapter.” But you didn’t think a franchise with roughly $1 billion in worldwide ticket sales was going to die that easily, did you? In true horror film fashion, the series will resume its torture killings on Oct. 27 with an R-rated eighth installment titled “Jigsaw.”Less expected: Lionsgate’s decision to promote “Jigsaw” by shaking an angry fist at America’s blood-donation regulations. (Barnes, 9/24)

The Larson quadruplets started kindergarten this month in Lima, N.Y. For any 5-year-old, this would be a normal event. But for Cooper, Brody, Ashlyn and Kylie, it was a hard-fought achievement. The quadruplets were born at 25 weeks and four days, said their mother, Courtney Larson, 31. (A normal pregnancy usually lasts 40 weeks.) (Ali, 9/24)