there are a number of varieties of flu circulating the globe, constantly mutating, and each year there is an international decision to pick the ones that seem most common and most dangerous, and manufacture vaccine cocktails against three or four of them. So far, it seems that the CV9 RNA jabs protect against the identified mutations. If this is so, you may not need annual jabs.
It also seems that the RNA jabs are easier to modify and faster to produce if required.
the flu inoculations have a much lower efficacy than the CV9 jabs so, in the event that mass protection becomes popular, herd immunity will be easier to achieve.
There is, so far, no long experience of how long CV9 protection lasts, because they have only been used for a few months. That's why the known periods of protection are quite short, and so far, seem to increase by a month every month.
There are three races for vaccines. At the moment we are in the first race, for the earliest.
The second race has already started, for the best.
The third race will be for the cheapest.
For example, UNICEF can buy Polio vaccines for between 10 and 20 US cents per dose. Countries with good public health systems, or international support, are able to almost exterminate the disease without charge to the citizen. See https://www.unicef.org/supply/reports/oral-polio-vaccine-opv-price-data
Diptheria and Tetanus combined, about 17 US cents. https://www.unicef.org/supply/reports/diphtheria-and-tetanus-dt-vaccine-price-data
These treatments have greatly reduced infant mortality around the world.
Obviously, countries with inefficient and expensive healthcare businesses, such as one to the south of Canada, can charge their customers far more.
