It's not just a couple of dissenters, the official position of WHO is the same - we need to vaccinate the whole world before booster shots and vaccinating children in the rich countries.
As I see it there _is_ a consensus among scientists and healthcare professionals, but not among politicians who see booster shots necessary to keep their national economies up.
>At 6 months post-vaccine, 70% of the infection-naive NH residents had neutralization titers at or below the lower limit of detection compared to 16% at 2 weeks after full vaccination. These data demonstrate a significant reduction in levels of antibody in all groups. In particular, those infection-naive NH residents had lower initial post-vaccination humoral immunity immediately and exhibited the greatest declines 6 months later. Healthcare workers, given their younger age and relative good-health, achieved higher initial antibody levels and better maintained them, yet also experienced significant declines in humoral immunity. Based on the rapid spread of the delta variant and reports of vaccine breakthrough in NH and among younger community populations, boosting NH residents may be warranted
That study suggests that 16% of the elderly have no immunity to covid 2 weeks after vaccination and 70% after 6 months.
Not to put too fine a point on it, but we might as well not vaccinate anyone over 60 if we're not going to be giving them boosters every 3 months or so.
Neutralizing antibodies are only part of the immune response. Not having a detectable level does not at all imply having "no immunity". Antibodies are expected to disappear over time, but cellular immunity is much more long-lasting.
As I see it there _is_ a consensus among scientists and healthcare professionals, but not among politicians who see booster shots necessary to keep their national economies up.