I received first dose of astrazeneca covid-19 vaccine at the end of april. i am now planning to receive 2nd dose of pfizer vaccine at end of july. is my gap between first and second dose too long or still adequate?

Thirty days as an interval was initially recommended, but the delay within three months is also acceptable. A test for antibody levels is available after two weeks post vaccination.

Previously one should have had the same vaccine, but current recommendations are the second vaccine may be given without concern for manufacturer. The CDC does not recommend restarting the series, so the second dose should be given and should be effective.