I thought we already knew that two shots give you 6 months of immunity, assuming people with boosters are the 39.5%, wouldn't the 60.5% be just as susceptible
Gibraltar's economy is tourism- and travel-centric. Just using the population of people who live there full-time doesn't capture anything about the disease spread or vaccinations with temporary visitors (upwards of five million per year).
The argument is that herd immunity for covid cannot be attained via vaccines. Not even 100% vaccination.
The comparison with measles, another contagious airborne disease, is instructive. The threshold for herd immunity is estimated at 94%. This is possible because the vaccine effectiveness against infection is also 93-97%. Unfortunately covid vaccines have waning effectiveness against infection, estimated at about 50% after 6 months, and possibly waning even further.
"Five reasons why COVID herd immunity is probably impossible"
"For example, the measles is a highly contagious illness. It's estimated that 94% of the population must be immune to interrupt the chain of transmission."
"One dose of MMR vaccine is 93% effective against measles, 78% effective against mumps, and 97% effective against rubella. Two doses of MMR vaccine are 97% effective against measles and 88% effective against mumps."
