[kordless]

You can safely assume there are drains in the floor wherever these things are stored. The drains would be for carrying away cleaning solutions for the environment.

Someone broke something, or opened something, or knocked over something. 45 liters of water is about 100 US pounds, so it was probably a single smallish, somewhat portable storage unit that got affected.

I agree the wording is less than ideal, but I'm not sure there is a 'coverup'.

[gonzo]

I can tell you've never seen a level 3+ lab.

Polio requires level 4.

http://www.biosafety.be/Polio/GlobalActionPlanWHO.pdf

[ceejayoz]

Your link directly contradicts you.

> Wild polioviruses are classified as risk group 2. The rationale for the minimal biosafety levels is the near universal immunization of the population with OPV and/or IPV. Biosafety Level 2 (BSL-2) is the currently recommended minimal standard for all countries. To ensure safe handling of wild polioviruses and potentially infectious materials as eradication nears (Pre-Eradication), BSL-2, hereafter referred to as BSL-2/polio, should be enhanced by specific practices described in this document (Box 10).