CLEAN : MSF says 3600 Syrians showed neurotoxic

The transcript describes a situation in three hospitals in a Damascus suburb where 3600 patients with neurotoxic symptoms arrived within three hours, resulting in 355 confirmed deaths. There is uncertainty about the cause, as no scientific evidence or samples were collected to confirm the use of chemical weapons. The symptoms included convulsions, vision problems, and respiratory distress.

What challenges did the doctors face in taking samples?

What is the significance of neurotoxic symptoms mentioned in the text?