The 1918 flu pandemic, commonly referred to as the Spanish flu, was a category 5 influenza pandemic caused by an unusually severe and deadly Influenza A virus strain of subtype H1N1.
Project Lead The Way (PLTW) is an American nonprofit organization that develops STEM curricula for use by US elementary, middle, and high schools.
A PLT blood test measures the number of platelets in the blood, states MedlinePlus. Platelets help blood clot. Normal values range from 150,000 - 400,000 platelets per microliter of blood, though these reference ranges vary slightly between laboratories. Continue Reading.