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Mouse Hepatitis Virus.



Micro-isolation (MI)

Cages maintained for animals in a Specific Pathogen Free (SPF) status.

Micro-isolation (MI) Technique

A method of housing and handling animals to maintain them free of disease-causing pathogens.

Micro-isolator (MI) Top

Micro-isolator (MI) top; used as a cover on rodent cages to prevent contamination within the cage.

Mill Date

Date that the food was formulated by the manufacturer.

Minor Recovery Surgery

A surgical intervention that does not expose a body cavity or that does not ordinarily have the potential to result in impairment of a vital physical or physiological function.

Examples of minor survival surgeries include:

  • Cranial burr holes that do not expose dura or brain
  • Subcutaneous implants
  • Peripheral vessel cannulation (peripheral approach)
  • Castration (scrotal or prescrotal approach)
  • Oral surgery and tooth extractions not involving bone
  • -Oscopies into natural openings that involve biopsy
  • Small digit or tail amputation
  • Surgical repair of superficial injury


Minors are defined as anyone under the age of 18.


Minute Mouse Virus.


A severely debilitated state that precedes imminent death.


Mouse Parvovirus.


Medical Sciences Building


Mobile shelving unit.

Multimodal Analgesia

Multimodal analgesia is defined as a combination of systemic analgesics, like an NSAID and an opiate, or a combination of a systemic analgesic/s and a local anesthetic.


An animal that has not been administered an infectious hazard, human derived substance, or chemical hazard/toxin.


North Campus Research Complex

Necropsy Report

A report of gross and/or histologic post mortem findings.

Negative Control

Indicator vial that has no printing on it that is autoclaved in the same liquid filled bottle as the BI (with printing on the vial). A color change indicates thermal degradation has occurred.

Negative Pressure

Room is kept at a lower pressure than the surrounding rooms/hallway, causing air to flow into room from surrounding areas when door is opened.

Neonatal Pups

Rat or mouse pups without fur, eyes not open (approximately 10 days old or less).

Nesting Device

Shepherd Shacks®, igloos.

Nesting Material

Commercially available shredded paper (e.g. Crinkle nest, Envirodri or Enviropaks), nestlets, Alpha Dry or Carefresh bedding.


Cleaner used for decontaminating frog and fish nets.

Neutral Pressure

No significant flow into or out of room when door is opened.

New Arrival Cage Card

Pre-printed, electronically generated bar-coded cage card with the following information listed: PI, account #, protocol #, source, species, strain, and arrival date. Lab contact information and special instructions may also be included on the cage card.

New World Monkeys (NWM)

South American monkeys including squirrel monkeys, owl monkeys, marmosets, and tamarins.


National Formulary.


Produced by beneficial bacteria in biological filter; converted from toxic ammonia and nitrite; contributes to algal growth. Recommended level = 40 ppm or less.


Produced by beneficial bacteria in biological filter; converted from toxic ammonia; high levels impair respiration and lead to suppressed immune systems. Recommended level = 0 ppm.


Neuromuscular blocking agent.

Non USDA-Regulated Species

A term that refers to animals whose care is NOT governed by the Animal Welfare Act. This includes rats of the genus Rattus and mice of the genus Mus bred for research, birds, fish, reptiles, and amphibians.

Non-Animal Support Space

Non-animal support space includes:

  • Cage wash
  • Food, bedding, supply rooms
  • Procedure rooms (only used for procedures, not approved for housing animals)
  • Cubicle ante-rooms
  • Euthanasia rooms

Non-Human Primate (NHP)

Rhesus macaque, baboon, marmoset.

Non-Pharmaceutical Grade

Chemicals or compounds that do not meet or exceed requirements of USP/NF/BP and may have higher levels of impurities that can introduce unwanted variables or toxic effects. Sterile pharmaceutical grade preparations that are reconstituted, diluted, mixed or have other substances added are also considered non-pharmaceutical grade. 

Non-Recovery Surgery

A surgical intervention in which an animal is euthanized before recovery from anesthesia.

Non-Rodent Mammal

Rabbit, ferret, dog, cat, swine, sheep, cow, non-human primate, etc.

Non-Rodent Mammals Conditioned

Animals (e.g., rabbit, ferret, dog, cat, swine, sheep, cow, non-human primate, etc.) with known health history.

Non-Rodent Mammals Non-Conditioned

Animals (e.g., rabbit, ferret, dog, cat, swine, sheep, cow, non-human primate, etc.) with unknown health history.

Nonsteroidal Anti-Inflammatory (NSAID)

Nonsteroidal anti-inflammatory (NSAID) drugs are those such as carprofen, meloxicam, flunixin, or ketoprofen.

Noted Observation (NO)

Conditions that do not initially require the generation of an ATR and require husbandry personnel to place a dated, clear acetate over the cage card describing the condition observed.