dr. urvashi rangan headed a study of imported shrimp for the june 2015 issue of the influential magazine "consumer reports." >> of the 205 imported farm samples that we found, 11 of those actually had illegal residues of antibiotics on them. that comes out to about 5% of the imported farmed shrimp samples being contaminated with an illegal antibiotic residue. the fact that the fda only tests about .7 percent of all the shrimp in this country for those antibiotic residues suggests that the agency is not actually testing enough shrimp to catch the amount of illegal residue products that may be coming into the market. >> however, many of the countries that export the shrimp permit the use of antibiotics. >> when you feed low levels of antibiotics every day, you're not feeding them enough to necessarily kill bacteria. those bacteria can become resistant to those antibiotics that can make those antibiotics less effective in people if we're infected by those bacteria. >> just as worrisome was the number of shrimp that tested positive for bacteria. >> we found about a third of the shrimp that w