No, the expansion is pretty flexible about which new features to include/exclude. You can just include a 5th player and choose the number of events/epidemics as you normally would.
By Robert Hill on 04 April 2016
When I bought it last year, it came with the petri dishes. I can't say for sure it'll still be the same edition now. You might need to contact Amazon / Seller to get them to check.
By T. Lam on 30 June 2016
I did and it was English. There has been some confusion caused by the listings I believe but if you want the English version then you should be safe. There is always your right to return? Hope this helps.
By M. Long on 15 June 2017