Comment by ggrothendieck

Also they say they used the Fisher exact test and got a p value for mortality of 0.09 so it seems they were doing a two-sided test which is the default for fisher.test in R.

  ivm <- c(3, 247-3)
  con <- c(10, 249-10)
  m <- rbind(ivm, con)

  fisher.test(m)$p.value
  ## [1] 0.08809225

However, I think a one sided test could be justified and in that case it is significant at the 5% level.

  fisher.test(m, alternative = "less")$p.value
  ##        ivm 
  ## 0.04541928