They may not even need significant trials. They don't have to prove the whole thing from scratch for a modification. It will be bundled in the flu shot and basically flu season will become deadlier than it is, but nothing like what this first round of novel infection was. (Similar to what happened with the flu pandemic 100 years ago.)
Speaking of the flu, it's been virtually non-existent. There's been so few cases of influenza this year that Canadian public health officials still can’t declare the official start of flu season. Approximately 32 per cent of adults 18 years old and older were vaccinated for the flu, with 70 per cent of seniors 65 years and older being vaccinated, according to the 2020-2021 Seasonal Influenza Immunization Coverage Survey.
The 2021 flu season will go down in history as the epidemic that never was. By this time of the year, Canada has normally logged an average of more than 43,000 confirmed cases of influenza. But this year, the Public Health Agency of Canada says there was a total of just 66 confirmed cases as of March 20. There has been no evidence of flu spreading in the community, no confirmed outbreaks and the number of hospitalizations and deaths due to the flu is zero.
Just goes to show wearing masks, washing hands and social distancing works.