Scientists meet at the World Health Organization early every year to predict what strains will be most prominent, and then make and distribute those vaccines over a period of months based on those predictions - putting medicine a few steps behind the quickly-mutating influenza.
The Centers for Disease Control and Prevention (CDC) established National Influenza Vaccination Week (NIVW) in 2005 to highlight the importance of getting a flu vaccination.
Number of times each month during which the flu season peaked from 1982 to 2016.
This year's predominant strain, H3N2, historically has produced more severe seasons.
She said a flu vaccine helps more than the person receiving the shot.
Deti cautions that the county data is often inaccurate because many people do not go to the doctor when they have the flu and those who do often don't get officially tested and diagnosed.
The possibility of a low-effectiveness flu vaccine this year "underscores the need to strive toward a 'universal' influenza vaccine that will protect against seasonal influenza drift variants, as well as potential pandemic strains, with better durability than current annual vaccines", the officials said in their paper.
The Edmonton zone has reported 167 lab confirmed cases and 61 hospitalizations. "Flu is more likely to lead to hospitalization or death for people in the high risk groups, and their first line of defense is vaccination". The two people who died were older than 65, according to a release from the health department.
For Calgary's Laura Hampton, any protection against the flu is good protection when it comes to her one-year-old son Jack. "As long as flu viruses are circulating, it's not too late for New Mexicans to get vaccinated". They're especially vulnerable to flu's unsafe complications because they tend to have more underlying health problems than younger people - and because standard flu shots don't work as well with age-weakened immune systems. But past year, a baffled CDC said it was no longer protecting against certain influenza strains as well as regular flu shots - and told doctors not to use it. "The best flu vaccine is the one that you get".