What has the author E A Jenner written?

You're likely thinking of Edward Jenner, the English physician who is credited with pioneering the first vaccine for smallpox. He is not known for writing any books or novels.

However, he did publish several medical papers and letters on his research and observations, including:

* An Inquiry into the Causes and Effects of the Variolae Vaccinae (1798), which detailed his findings on cowpox and its effectiveness in protecting against smallpox.

* Further Observations on the Variolae Vaccinae, or Cow Pox (1799), which offered further evidence and addressed critiques of his work.

While not a prolific writer of fiction, Jenner's scientific contributions were crucial in the development of immunology and have had a profound impact on public health.