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Not the case. I was scheduled to get my second dose of Sinovac on July 29. I asked to switch when I arrived, but they were planning on giving me Sinovac until I made the request. There were plenty of people getting Sinovac that day and the the Sinovac rooms were very busy with people going in and out. In fact, there were more rooms set up for Sinovac than there were for AZ and from my observation, more people had Sinovac on the instruction papers I saw than AZ.

Thanks. I decided to mix, but as I indicated it wasn't a clear cut choice given I agree with the belief that Sinovac does do a good job with severe symptoms and I was hesitant to turn down that. Unfortunatelly, there's no real way for me to know if it was or was not the right call, but at least I've got some peace of mind now and hopefully have protection from severe issues. At this point, I can't change the decision ... and since that's no longer in my control, I'm not going to worry about it. I'll keep my eye out for an mRNA or a second AZ shot down the road, but will likely wait for a paid option or until Thailand has enough to go around for all of those that haven't gotten a vaccine and want one. Now that I've got two behind me, if they decide down the line to not require quarantine for vaccinated people in BKK, a short trip for a booster would also be an option. Unfortunately, it doesn't feel like the quarantine requirement will be going away any time soon.

There was no question of keeping the appointment or not - it was going to definitely be kept. Also, the option of requesting AZ was possible, so the due dilegence on which to ask for was time well spent. I agree not to won't worry about what I can't control, but here there was at least the potentional of having some control. I just finished up and ultimately, they initially did give me a slip for second dose of Sinovac. I do believe that while Sinovac overall efficacy is lower (pretty clear info on that), Sinovac does provide fairly good protection against severe symptoms. On the other hand, the info on Sinovac-AZ mix is extremely limited. For that reason, it wasn't a clear cut choice, but I did decide was comfortable with the mix (and the added protection it hopefully provides), so asked to change. It added about an hour to the trip as they redid paperwork, etc., but they were able to make the switch. In regards to it being official policy, that seems to be the case but it appears the next few weeks are going to dictated on getting more AZ doses so that they can actually follow that policy. For those coming up on their appointment for a second dose of Sinovac, I think for the next short while it will stay Sinovac. I saw a lot of people with "Sinovac Shot 2" paperwork today, so clearly that is still the approach being used. Also, the process today was much less organized then when I got the first shot four weeks ago. Four weeks ago was great - everything was clear, fast and well done. Today wasn't bad by any means, but they have completely changed how (and where) they are doing both initial registration and the vaccinations. It wasn't nearly as well organized and there were quite a few confused people. The staff was great and very helpful, which helped offset this for the most part. Kudos to them.

@internationalism- thanks for response. I understood that using AZ as a 3rd booster shot was for medical staff, but all the articles I read seemed to indicate that the "AZ as a second shot approach" was for everyone, not just medical staff. If what you said is true, I'll still probably decide beforehand and ask (if I decide on AZ), then maybe it won't matter if I can't get approved. (Forbes article and BBC article) @oldcpu - completely aligned with you in regards to the best vaccine being the one available. That's why I jumped on the Sinovac 1st shot with no regrets. Now that I might have the two available to me for shot #2, just making sure to do as much due dilegence as possible. I did read that article you posted and it was one of the most useful in helping with the decision. Thanks for posting. What it doesn't mention at all is are there any side effects of mixing, which is one of the first concerns that popped up in regards to this. It seems the short-term negative side effect concerns have subsided a bit(?) - I haven't seen any big issues so far with this approach. If AZ was more readily available, the S+S+AZ option would be great ... but slim to no chance AZ will be available (and even if it is, it would be better used on an unvaccinated person than on me at that point).

I was fortunate enough to get a slot on the thailandintervac expatriates site during the short time it was open back in mid-June. Sinovac appointments were all that were available when I got through and I happily grabbed an appointment before it disappeared. Since the beginning of all of this, I've been of the mindset to get vaccinated with what is available to me and get something better (if necessary) when it becomes available to me. Delta will almost certainly mean I will need something better down the road, but I have no regrets that I took the shot that was made available to me. I'm struggling with how to ask the question without this thread becoming another one of the many threads that have been highjacked with similar arguments over and over, so I'll just ask - please keep help to keep on topic. I have to make a decision on short order and would really appreciate any pertinant real information. My second shot is coming up tomorrow. I reached out to confirm that I'd be getting AZ for my second shot (given the mixed vaccine directive announced in early July). I expected a short "Yes, you'll get AZ" answer - but to my surprise, I was told I'd get Sinovac by default. They then proceeded to tell me I could request AZ and I could switch (assuming AZ availability on the day of appointment, which is not guaranteed). While part of me is happy I might have a choice and won't have the mixing of vaccines forced on me, a bigger part of me didn't want to have that decision to make under short notice. Now, I'm trying to do a crash course education session so I make the best choice available to me. I've read as many threads as I can on here and researched on other sites, but as you all know - information on this is hard to find at this stage. Is there any information out there that anyone has read that would help with that decision if you were the one making it? With an mRNA vaccine booster likely unavailable to me until next year, I'm feeling a bit of pressure with this decision. I'm leaning towards requesting AZ as the second shot, but do have some lingering concerns about mixing. When they first announced the Sinovac and AZ mixing approach, my big concern was that it wasn't safe to do so. However, to the best of my knowledge, they have been doing this mixing for at least a few weeks and I haven't seen any big red flags from those that have mixed vaccines. Has anyone seen anything contrary to that? But to restate, the decision I'm debating is between (1) Sinovac-Sinovac and (2) Sinovac-AZ since I've already gotten Sinovac for my first shot. Just looking for help with what I can control and not all the external factors I can't. I can't undo the shot I've already gotten (nor would I want to undo it) and none of the mRNA vaccines are available to me at this immediate moment for the decision at hand, so no need for me to wish for what I can't have. The reality is that I'm staying upbeat and come this time tomorrow, I'm going to be happy either way ... but obviously, I'd like to make the best decision with the facts I can scrounge up between now and then. I'm also curious if others still got the Sinovac-Sinovac combination recently? I saw a couple posts in the past couple weeks saying "I'm on my way for my second shot and assuming it will be AZ" but couldn't find any follow up on whether that is what was actually provided. Thanks much in advance for any real help you might be able to provide - it will be much appreciated.