# US 4,391,822 A · Method for preventing cats from shedding Toxoplasma oocysts after infection of such cats

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- Number: US 4,391,822 A
- Document ID: US4391822A
- Status: Granted
- Kind: A
- Application number: 06/403,788
- Filed: 1982-07-30
- Granted: 1983-07-05
- Earliest claimed: 1982-07-30
- Assignees: Kansas University Endowment Association
- Inventors: Jacob K. Frenkel; Donald D. Smith
- Web page: https://patentgrep.com/patent/US4391822A

## CPC

- A61K 31/70: Carbohydrates; Sugars; Derivatives thereof (sorbitol A61K31/047)
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)

## Abstract

A method of preventing, or at least substantially minimizing, shedding of Toxoplasma oocysts by cats is described which can be begun after infection of the cat and may serve to reduce the contamination with infectious oocysts of soils around areas of human habitation. The method involves administration, in effective amounts of a drug agent selected from the group consisting of monensin or salinomycin. The administration is preferably oral, and can be accomplished by mixing the drug with the cat's food or via a slow release dosage form. The drug treatment is normally commenced within about two days after infection, and is continued for a period of at least about two weeks.

## Claims

### Claim 1

A method of preventing or minimizing shedding of Toxoplasma oocysts by a cat after Toxoplasma infection of such cat, comprising the steps of administering to the cat, prior to the onset of oocyst shedding, an effective amount of an agent selected from the group consisting of monensin and salinomycin, and continuing such administration for a period of time thereafter sufficient to maintain said prevention or minimization.

### Claim 2 (depends on 1)

The method as set forth in claim 1, said administration commencing within 2 days from the time of ingestion by said cat of Toxoplasma-infected food, and continuing for a period of at least about two weeks thereafter.

### Claim 3 (depends on 1)

The method as set forth in claim 1, said agent being admixed with and fed with the daily ration of said cat.

### Claim 4 (depends on 3)

The method as set forth in claim 3, said agent being monensin, and being administered at a level of at least about 200 mg. per kg. of cat ration.

### Claim 5 (depends on 4)

The method as set forth in claim 4, said level being from about 200 to 300 mg. per kg. of cat ration.

### Claim 6 (depends on 3)

The method as set forth in claim 3, said agent being salinomycin, and being administered at a level of at least about 50 mg. per kg. of cat ration.

### Claim 7 (depends on 6)

The method as set forth in claim 6, said level being from about 50 to 100 mg. per kg. of cat ration.

### Claim 8 (depends on 1)

The method as set forth in claim 1, said agent being monensin and being administered at a level of from about 6 to 8 mg. per kg. per day of body weight of said cat during said period of time.

### Claim 9 (depends on 1)

The method as set forth in claim 1, said agent being salinomycin and being administered at a level of from about 2 to 3 mg. per kg. per day of body weight of said cat during said period of time.