Earlier today, I got another Covid-19 booster shot. My 2nd booster – a 4th dose. It was ½ the normal Moderna mRNA vaccine dose, so technically I've had 3½ doses
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I got both boosters thru my rheumatologist because I have an auto-immune disease. It's treatment suppresses my immune system. I hope its only partial suppression, and not complete suppression. So, just in case, I got the booster shots, last August and again today.
As of 23 Feb 2022, the CDC now recommends a 3rd booster dose of vaccine, for patients (those not moderately to severely immune-compromised), to complete their primary vaccination series. Patients can receive their Moderna or Pfizer booster (mixing or matching is OK) at least 5 months after completing the primary vaccine series. Patients who received J&J as their primary dose are eligible to receive their mRNA-type booster dose as soon as 2 months after the 1st dose.