poo encrusted behind with foul smell

[quadrupletmom]

My 18 week old barred rock pullet had a poo encrusted behind yesterday. Almost completely covered up but not quite. I peeled all of this off, which also took off the skin, washed it off with water, dried off with clean paper towel and applied the purple dye with the blotter. Today, her behind stinks like crazy, as it did yesterday, she acts a little droopy and I am unable to tell you whether she is eating or drinking. Is there an antibiotic at Tractor Supply that I can purchase to give orally, or intramuscularly or add to water to help her. My flock is 28 strong plus 3 pekins and she is at the absolute bottom of the pecking order. I am afraid to separate her again (previous injury) for fear she will be even more abused when re-introduced to the flock. Advice welcomed!

 

[dlhunicorn]

Does this bird come from a pullorum free stock? It sounds like salmonellosis and may be pullorum here is an article on that:
http://www.thepoultrysite.com/diseaseinfo/132/salmonellosis-paratyphoid-infections

...and here one on pullorum :
http://www.msstate.edu/dept/poultry/disbact.htm
(excerpt)
"Pullorum Disease
Pullorum disease is an acute or chronic infectious, bacterial disease affecting primarily chickens and turkeys, but most domestic and wild fowl can be infected.
The cause is a bacterium named Salmonella pullorum. This organism is primarily egg transmitted, but transmission may occur by other means such as:


Infected hen to egg, egg to chick, or chick to chick in incubator, chick box, brooder, or house. Survivors become infected breeders (cycle begins again),
Mechanical transmission (carried around on clothes, shoes or equipment),
Carrier birds (apparently healthy birds shed the disease organisms),
Contaminated premises (from previous outbreaks).
Disease organisms may enter the bird through the respiratory (as in the incubator) or digestive systems. Most outbreaks of acute pullorum disease in chickens or turkeys result from infection while in the hatchery.
Pullorum disease is highly fatal to young chicks or poults, but mature birds are more resistant. Young birds may die soon after hatching without exhibiting any observable signs. Most acute outbreaks occur in birds that are under three weeks of age. Mortality in such outbreaks may approach ninety percent if untreated. Survivors are usually stunted and unthrifty. Infection in young birds may be indicated by droopiness, ruffled feathers, a chilled appearance with birds huddling near a source of heat, labored breathing, and presence of a white diarrhea with a "pasted-down" appearance around the vent. The white diarrhea symptom instigated the term "bacillary white diarrhea" that was commonly associated with this disease at one time. Gross lesions may be lacking in some adult birds.......................

Treatment primarily is a salvage operation and does not prevent birds from becoming carriers. Consequently, do not keep recovered flocks for egg production. Among the drugs used to treat pullorum disease are furazolidone, gentamycin sulfate, and sulfa drugs (sulfadimethoxine, sulfamethazine, and sulfamerazine).



http://poultryextension.psu.edu/Pullorum article.pdf