The actual embryo or fetal age (also known as conceptual age) is the time elapsed from fertilization of the egg near the time of ovulation . However, because most women do not know when ovulation occurred, but do know when their last period began, the time elapsed since the first day of the last normal menstrual period , the menstrual age, is used to determine the age of a pregnancy. The menstrual age is also known as the gestational age. Gestational age is conventionally expressed as completed weeks. Therefore, a 36 week, 6 day fetus is considered to be a 36 week fetus. TO LEARN MORE CLICK THIS LINK
While seasonal influenza (flu) viruses are detected year-round in the United States, flu viruses are most common during the fall and winter. The exact timing and duration of flu seasons can vary, but influenza activity often begins to increase in October. Most of the time flu activity peaks between December and February, although activity can last as late as May.
The figure below shows peak flu activity in the United States by month for the 1982-1983 through 2017-2018 flu seasons. The “peak month of flu activity” is the month with the highest percentage of respiratory specimens testing positive for influenza virus infection during that influenza season. During this 36-year period, flu activity most often peaked in February (15 seasons), followed by December (7 seasons), January (6 seasons) and March (6 seasons).