Where are you calling from? <a href=" http://www.inwaldpark.pl/fluticasone-propionate-cream-005-uses.pdf#digest ">fluticasone prop 50 mcg spray dosage</a>     The way that manufacturers determine which strains to safeguard against with the production of new vaccines is by looking at the available data from previous years, more specifically 2012, and determining what strains of the influenza virus were most heavily seen in circulation amongst the population. The success of these predictions is not completely guaranteed, as there are instances of strains of the influenza virus that emerge in a population that the specific vaccines in the area are not able to fight. What makes this year different is a new development in the fight against the influenza virus; the Quadrivalent vaccine. This new kind of vaccine protects against four different strains of the influenza virus, as opposed to the three that previous vaccines safeguarded against. This new vaccine will most likely prove more beneficial in children, who tend to catch the newly added strain more often than adults.