(CNN) AstraZeneca pauses coronavirus vaccine trial after unexplained illness in volunteer. Quoting,

“In large trials, illnesses will happen by chance but must be independently reviewed to check this carefully. We are working to expedite the review of the single event to minimize any potential impact on the trial timeline. We are committed to the safety of our participants and the highest standards of conduct in our trials.”

Chance is one possibility. For another, see  Why I Defend FDA Commissioner Stephen Hahn. Quoting,

This sounds informative, but it leaves out a crucial safety question, discussed in Why I Would Not Take the Russian or Oxford – AstraZeneca Vaccines – Part 2. Quoting the nut of it,

After a while, we’re ready to harvest the culture medium for the virus we want, the Kamikaze, purifying it of the helper virus. We don’t want the helper virus in our vaccine, because it  does not contain the code for the spike protein, and it can replicate…

Very small quantities of live, helper adenovirus are present in the finished vaccine product.  Supporters of these vaccines make these claims:…