9 CFR § 113.42 - Detection of lymphocytic choriomeningitis contamination.

---
identifier: "/us/cfr/t9/s113.42"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "9 CFR § 113.42 - Detection of lymphocytic choriomeningitis contamination."
title_number: 9
title_name: "Animals and Animal Products"
section_number: "113.42"
section_name: "Detection of lymphocytic choriomeningitis contamination."
chapter_name: "ANIMAL AND PLANT HEALTH INSPECTION SERVICE, DEPARTMENT OF AGRICULTURE"
subchapter_number: "E"
subchapter_name: "VIRUSES, SERUMS, TOXINS, AND ANALOGOUS PRODUCTS; ORGANISMS AND VECTORS"
part_number: "113"
part_name: "STANDARD REQUIREMENTS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 151-159; 7 CFR 2.22, 2.80, and 371.4."
regulatory_source: "34 FR 18004, Nov. 7, 1969, unless otherwise noted."
cfr_part: "113"
---


# 113.42 Detection of lymphocytic choriomeningitis contamination.

The test for detection of lymphocytic choriomeningitis (LCM) virus provided in this section shall be conducted when such a test is prescribed in an applicable Standard Requirement or in a filed Outline of Production. Vaccine virus may be neutralized with specific antiserum when necessary.

(a) Each of at least 10 mice obtained from a source free of LCM shall be injected in the footpad of a hindfoot with 0.02 ml of the material being tested and observed each day for 21 days.

(b) If any of the mice show swelling in the injected footpad or if more than one becomes systemically abnormal, the material being tested is unsatisfactory.

[42 FR 6794, Feb. 4, 1977]