I've been thinking about this for a while now. The critical factor is how quickly you can get away from the vaccination site and apply these. I suppose they (the chemical treatments) could be applied shortly before the vaccination as well, and still be effective. Might as well do both. These countermeasures presume a virus in vaccinations, perhaps a viral vector to change our neuropsychology, make us more docile. Etc. Who knows what kind of shit they'll put in a Corona vaccine.

1. DMSO - a potent transdermal antimicrobial. It penetrates deeply into tissue quickly after application on the skin. Do not refrigerate (it crystallizes), and DO NOT allow it to become contaminated with anything. It is also good for survival supplies. If things break down, we may have to treat infected cuts and wounds ourselves. Don't get it in or near your eyes or in the nose. Not for applying to cuts or wounds unless it is an emergency. On some parts of the body, it feels like a burn for 30 minutes, on others, nothing. Generates heat when mixed with water. Try a small spot on your skin before applying a larger amount. Best when diluted with distilled water to 75 - 80% DMSO. It is also a potent and long-lived local anesthetic, often good for back pain or arthritis. Health Benefits of DMSO ...  DMSO 16 oz Ebay

2. Magnesium Chloride strong solution - As above, no need to refrigerate, do not ingest, use transdermally, don't get in eyes or nose, or in cuts. Potent antibacterial, but ineffective against fungi, so drastic overuse may promote fungal infections (not a serious concern, you have to really go overboard). Also promotes sleep. A coffee cup of the crystals in a tub of bathwater always puts me to sleep, like doubleplus Epsom salts. It is a fraction of sea salt. Would be a godsend for those going through opiate withdrawal due to supply chain disruptions. Often good for back pain or arthritis. Polydrug treatments for viruses oft target the magnesium receptor. Look in your local yellow pages under "salt", it is sold as an ice-melter in 50 lb bags ($22 here in Ohio). It is also sold for marine aquariums. Good to have in a survival situation. Available for cheap on Ebay.

3. Allantoin - Some references say it is effective against a broad range of viruses, bacteria and fungi. Some do not. I believe it is. Make sure if you buy some that it is synthetic. Most of it is synthetic, it is very much cheaper than  extracting the organic. The organic allantoin, from plants, also has toxic alkaloids. The synthetic does not. Good for survival applications, as it heals most wounds rapidly. It is anti-inflammatory, antidiabetic, etc. Don't get it in your eyes, though. Must be added to DMSO to be used transdermally.

4. DMSO and magnesium chloride / DMSO and allantoin. I've used both. With the allantoin, on some parts of the body, it makes a severe burning sensation. On others, nothing. Either combination should be more effective against viruses and bacteria than DMSO alone.

5. Blood / tissue electrification. -

One doesn't need to buy a Beck electrifier. Various electro-muscle stimulators will provide the necessary output. My choice is the TENS 7000, cheap on Ebay. Details on blood electrification can be found online. But basically it amounts to, in the case of a vaccination, placing the electrodes on either side of the injection site, with a few inches between them.