11-17-2012, 07:17 AM
Unless you're dipping your water straight out of the tank, you're extremely unlikely to get lungworm from catchment water even if there are slugs in it. Worms are relatively big - the infective stage worms average 500 microns long (half a millimeter, big enough to be seen with the naked eye) and 25 microns wide. Most sediment filters are 5 or 1 micron. So for the water, worry more about the rats and their bacteria 
Here's a picture: http://www.dpd.cdc.gov/dpdx/html/imageli...is_il5.htm
Also, remember that unlike bacteria and viruses, the worms can't multiply in the human body. That's why picking up one or two from a slime trail isn't going to do much compared to 10,000 at once from accidentally eating an infected slug.
Here's a picture: http://www.dpd.cdc.gov/dpdx/html/imageli...is_il5.htm
Also, remember that unlike bacteria and viruses, the worms can't multiply in the human body. That's why picking up one or two from a slime trail isn't going to do much compared to 10,000 at once from accidentally eating an infected slug.