The green dots are HIV virus particles on a human white blood cell. CDC hide caption
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Friday
A baby receives a polio vaccine at the Medina Maternal Child Health center in Mogadishu, Somalia, on Wednesday. Somalia has one of the lowest immunization rates in the world. Ben Curtis/AP hide caption
Friday
A health worker collects pigeons from a trap at People's Square in Shanghai, China, earlier this month. So far, workers have tested more than 48,000 animals for the H7N9 flu virus. ChinaFotoPress/Getty Images hide caption
Wednesday
A vendor weighs a live chicken at the Kowloon City Market in Hong Kong Friday. Health authorities there have stepped up the testing of live poultry from China to include a rapid test for the H7N9 bird virus. Lam Yik Fei/Getty Images hide caption
Tuesday
Renande Raphael, aged 16 months, is measured to check whether she is growing normally. She's part of a trial in Haiti to see if an extra daily snack of enriched peanut butter prevents stunting and malnutrition. Alex E. Proimos/via flickr hide caption
Friday
A child wears a mask near a closed section of a poultry market in Shanghai, where health workers detected the new bird flu, H7N9. Eugene Hoshiko/AP hide caption
Thursday
Bill Gates watches as a child is vaccinated at the Ahentia Health Centre in Ghana in March. Pius Utomi Ekpei/AFP/Getty Images hide caption
Tuesday
A child is immunized against polio at the health clinic in a farming village in northern Nigeria. The procedure involves pinching two drops of the vaccine into the child's mouth. For full protection, the child needs three doses, spaced out over time. David Gilkey/NPR hide caption
How To Get Rid Of Polio For Good? There's A $5 Billion Plan
Friday
Dr. Nayna Patel performs an ultrasound exam on Rinku Macwan, at a hospital near Ahmedabad, India. It's illegal in India for doctors to reveal a baby's sex during these exams, but many do it anyway. Sam Panthaky/AFP/Getty Images hide caption
Monday
An estimated 15 billion condoms are manufactured each year and 750 million people use them. ederk/iStockphoto.com hide caption
Friday
A young boy plays on a commode during an event for World Toilet Day in New Delhi in November. An estimated 131 million Indian homes don't have a latrine or a clean toilet. Raveendran/AFP/Getty Images hide caption
Thursday
About a third of the world's population is thought to be infected with Mycobacterium tuberculosis, but only a small fraction of people get the disease. NIAID_Flickr hide caption
Wednesday
If you catch dengue fever in the Western Hemisphere, it most likely came from the Aedes aegypti mosquito. Muhammad Mahdi Karim/Wikimedia.org hide caption
Tuesday
A Palestinian dialysis patient is treated at the Shifa hospital in Gaza City in 2010. Many kidney patients in Gaza struggle to get proper dialysis therapy because machines are often overbooked. Khalil Hamra/AP hide caption
Can Kidney Transplants Ease Strain On Gaza's Health System?
Friday
A woman fends off the last blast of winter and the flu season in Philadelphia this month. Matt Rourke/AP hide caption