Imagine someone was in a hurry to get high immunity (the Sinopharm jabs are said to be at best only moderately effective) , or there was a free Pfizer booster jab available for a limited time.
What is known about how dangerous (if at all) would it be to get the Pfizer booster just one month after the second Sinopharm jab?
"Sinopharm’s Covid-19 vaccine is effective against the Delta variant and can be safely followed with a Pfizer-BioNTech booster shot, researchers have found.
In July, a small study carried out in Sri Lanka found it (sic) to be effective against the highly contagious Delta coronavirus variant.
Moreover, medics in the UAE said the immune system response was very strong once a double dose of the Sinopharm vaccine was topped up with a booster shot of the Pfizer-BioNTech vaccine."
No mention of timing.
Further down the same article it says,
"Dubai residents are eligible to take a booster shot of Pfizer-BioNTech three months after their last Sinopharm dose.
In Abu Dhabi, residents must wait six months after their last Sinopharm dose. They can choose between Pfizer-BioNTech or Sinopharm. Authorities have advised residents to take one Pfizer shot only as a booster. But in some cases they have been able to obtain two doses after receiving a doctor’s consent.
People working in the healthcare sector in Abu Dhabi can receive the booster shot three months after their second Sinopharm dose."
No mention of why it's three or six months for these different groups of people.
Further down it says,
"Anecdotally, people report a (sic) sore arm and minor swelling, with others feeling fatigue or symptoms similar to a cold, which pass in a few days.
In contrast, messenger RNA vaccines, such as Pfizer-BioNTech and Moderna, appear to come with more side effects.
According to a US Centres for Disease Control report, as of December 19, 112,807 people had received the vaccine (sic).
Of these, 3,150 – or 2.8 per cent – had suffered “health impact events”, listed as the inability to perform everyday activities, taking time off work or seeing a doctor as a precaution (sic)."
Even further down the long article it says,
"Concerns have been raised that antibodies to the virus fade quickly.
A large study carried out by Imperial College London in the autumn, involving 365,000 people, showed antibody levels dropped by a quarter in three months."
It's unclear which vaccine they are talking about. Presumably not Sinopharm which is not used much in the UK, which is presumably where the study took place. Antibody levels having dropped by a quarter in three months wouldn't make me use the phrase, "fade quickly". Maybe they meant "dropped to a quarter"?
