In particular, the exchange rate is the quantity of one currency required to buy or sell one unit of the other currency.* Jump straight to today's exchange rate or keep reading to understand what the exchange rate is and what that means to you.y using the current exchange rate, you see that $1 equals a little over .80 euros. Two US dollars equals about 1.65 euros; two euros equals about $2.40 in US money.
â¢ Vaccination is a type of immunization, but immunization is not necessarily vaccination alone. â¢ Vaccination is an artificial process, whereas immunization can be natural or artificial. Related posts: 1  Difference Between Cold and Flu. 2  Difference Between Measles and Chickenpox. 3  Difference Between DNA and RNA.
Some vaccines are designed to help the immune system prevent an infection and are called preventive vaccines. Other vaccines are designed to help people who are already infected to clear the infection and are called therapeutic vaccines. Currently, there are no effective HIV vaccines of either kind.