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Can only two doses of hep b vaccine build protective immunity?

As everyone know three doses of hep b vaccine is required to develop desired antibody titer. But what is the immunity status after two doses of vaccine. Can it protect if someone gets accidentally exposed to virus after the second dose.
Also taking vaccine doses from two different pharma companies is equally effective than from same company or its ineffective at all?
Hoping for ur helpful answers. Thank you!
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Avatar universal
There are multiple different vaccines. In the past you would need 3 doses, but in 2017 the US FDA approved another vaccine which you only need 2 doses, its for adults only, not children. You can mix vaccines from different companies.

Here is the link.

http://www.hepb.org/prevention-and-diagnosis/vaccination/guidelines/

http://www.hepb.org/prevention-and-diagnosis/vaccination/guidelines/
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Avatar universal
No but I was asking about the conventional vaccines which need 3 doses.
If someone took 2 doses and gets exposed to the virus will those 2 vaccines will help to protect against infection?
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1 Comments
In theory it should, the reason for the multiple doses is to get the body to build its own immunity. If someone gets exposed to the virus the vaccine antibodies should be able to help fight that as long as they are still on the schedule. When someone is exposed to Hep B it is in a very small amount, the vaccine should be enough to fight it.

Of course avoiding virus exposure is the best as much as possible even after someone is immune. There are things like occult hepatitis B etc which is not common but possible.
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