** Smallpox drugmaker Siga Technologies shares fall in
volume spike, now down 25% at $5.6 after FDA says there is no
authorized medicine for the treatment of monkeypox disease
** Shares fall after FDA says there is no human data
demonstrating the efficacy of SIGA's drug TPOXX for the
treatment of monkeypox urn:newsml:reuters.com:*:nL4N2Z61X1
** Monkeypox is a viral infection that causes symptoms
similar to, but milder than, smallpox
** FDA says however TPOXX is being made available under its
Expanded Access authorisation, which grants patients access to
an investigational medical product
** SIGA has shot up 137.3% this year
(Reporting by Nandhini Srinivasan in Bengaluru)
((Nandhini.srinivasan@thomsonreuters.com))