  Growing Concerns About Eggs   Most shoppers care as much about
where eggs come from as they worry about the origins of paper
towels or bath tissue. Not at all. Until now, that is.  A sudden
outbreak of salmonella has prompted a third recall by some of
the biggest egg producers in the country in only two weeks. The
Food and Drug Administration (F.D.A.) has warned that hundreds
of millions of eggs may be affected. Ironically, this latest
food safety breakdown is happening only a few weeks after new
guidelines for egg production were issued by the agency. Now
federal health officials say that contamination with salmonella
in eggs may be a more serious problem than they had anticipated
at the time when the new rules were established.  Egg-laying
chickens can get infected with salmonella from unsafe farming
methods, contaminated feed or insufficient sanitary procedures.
Once the hens are sick, they are likely to pass on the bacteria
to their eggs. People can only get affected if they eat
salmonella-tainted eggs