The hydatid tapeworm, E.granulosus, found in humans, dogs, cats, sheep, etc lays 100,000 to 1,000,000 eggs, called hydatid sand, a day inside the human or animal host, this is typical. Blood flukes aka schistosomas, strongyles aka roundworms and many other common parasites lay just as many eggs inside the human or animal host. The hydatid tapeworm developes segments, hydatid is most infectious. In each segment is a sac of eggs, in each sac of eggs are more daughter eggs, that is why it is so hard to cure many infectious diseases, tumors, cancers, blood, nerve, spine, fibroid, brain and cystic diseases, as the parasites multiply exponentially and cause the infectious diseases to spread. The eggs become encysted and are harder to kill inside the host. Hydatis eggs are called hydatid sand because the eggs are smaller then a grain of sand, so a high fecal count of is expected in a contaminated area. If one egg survives a treatment it will grow into a full tapeworm again.
Common transmission is thru fecal matter as the eggs are in fecal matter.
Infectious disease specialist mds use praziquantel, quinine, flagyl and a few other medicines. Dr. Hulda Clark called prazi, flagyl and quinine a few of the " better antiparasite medicines " as they penetrate the encysted egg sacs, kill adults larnal stages and eggs.
Problem is people reinfect over and over if they do not deworm themselves, thier family, thier animals and environment seasonally. People do not like to change thier habits, do the extra work or spend the money to keep thier pets, animals and environments free of contamination and dewormed seasonally and thier environment free of infectious eggs and larval stages.
A clean body and a clean liver help to expel eggs and keep parasite loads in check, environment and sanitation are very important to avoid reinfection, especially in hydatid infected areas. You basically want to avoid areas where a lot of infected dogs and animals deficate and there is inadequite sanitation. And you want to wash your hands before you eat and practice basic common sense hygiene with self, food, family members, pets, waste and environment.
I would not allow 1 tapeworm to live in my body or my loved ones bodies or pets body.
The waste and debris alone from one internal tapeworm or blood fluke is intolerable and no one needs to be a host to waste producing exponetially replicating parasites.
I personally am very particular about what I eat. I boil/distill my water before drinking. Our pet is dewormed seasonally and kept as an indoor cat and I avoid endemic infected areas. We wash our clothes in 2 ounces of clorox added to each wash. Infectious disease specialists, mds and vets can deal with infected people, animals and regions because they can afford to buy the cures and antidotes at cost. Even researchers and mds must sterilize thier labs and environments when studying infeced people,pets, regions and the infectious egg count load from an infected fields or humans or animals, under a microscope.
Basic hygiene, sanitation, common sense, clean water, clean food, clean living and knowing the antidotes helps keep a person, pet, animal and region free of infectious diseases. Infectious diseases are caused by parasite egg and larva transmission and are now endemic in usa.

is it right that we can only have one tapeworm per human?