That is very interesting, I don't remember my early vaccinations and the later ones were injections.
Covid tho is not the only shot that has a series, the newer Shingles is a two shot series, the vaccine for that virus that causes cervical cancer is I think a three shot series, and I believe Hepatitis is a couple shot series. Pneumonia also a two shot because I had to get the second shot of that this year.
I tried googling skin vaccinations and from the few sites I looked at it sounds like dermal vaccination has been around from the early 1900s and that studies in the mid 1900s had conflicting results about whether it was better or not. Then some more studies in recent years that had better study control (sounded like to me) think it is a superior method.
Then, I found the below info from a little over a year ago, so apparently people do still try to develop skin type immunizations. Maybe in the future we'll get that type.
What advantage does skin vaccination offer compared with regular vaccination?
Roukens: ‘A huge problem is that there are currently not enough supplies to vaccinate everyone at the same time. With skin vaccination, we can vaccinate more people using the same amount of vaccine. This means people would be vaccinated sooner.’
Is this a new method?
‘No, skin vaccination isn’t new. We have been using this method for some time now for rabies and yellow fever vaccinations. It is an excellent way to use the vaccine as sparingly as possible. We now want to find out whether the Moderna vaccine is also suitable for immunisation via the skin. We first plan to test its safety and will then work out how much vaccine is needed to provide good protection.’
So how does vaccination via the skin work?
‘The skin is full of dendritic cells, which act as the guards of the immune system. When they detect a virus, they warn other immune cells, which go on to attack the virus. Skin vaccination involves delivering a small amount of the vaccine precisely where these guards are located. This ensures that no vaccine is wasted. The dendritic cells absorb the vaccine and initiate the immune response. This should ultimately protect us against coronavirus.’
Will we soon be using skin vaccinations?
‘Possibly, but possibly not.’