FELASA Recommendations
FELASA Recommendations
Contents
Introduction 193
Section I General considerations 194
Section IT Monitoring animals from external sources 195
Section ill Monitoring animals kept in an experimental unit 195
Section IV Detection of previously undetected infections 197
Section V Microorganisms to be monitored 197
Section VI Methodology 197
Section vn Health monitoring report 197
References 197
FELASA-approved health monitoring report forms 199
testing to be done on the original sample for sufficient amounts of antibodies to give
validation purposes. reliable test results and are therefore not
suitable for serological testing. Instead,
immunocompetent animals (e.g. heterozy-
Sentinel animals gous litter mates) should be used. However,
In some units, there may not be a sufficient immunodeficient animals are well suited for
number of animals in an experiment for some bacteriological and parasitological investiga-
to be available for health surveillance. A tions.
sentinel programme may then be considered, The sentinel stock should be tested thor-
which guarantees that monitoring can be oughly before being introduced into the
performed according to these recommenda- experimental unit and prior to being used.
tions. The tests performed should be the same as
Sentinels are animals obtained from a tho.se used for the health monitoring pro-
breeding colony of known microbiological gramme.
status that are introduced into an experi-
mental laboratory animal population where Sample size and frequency of monitoring:
they act as surveillance substitutes for the schedule of testing
experimental animals. The number of animals sampled and the
Even when sentinel animals are used, frequency of the investigations should, in
samples and relevant data from experimental general, be the same as recommended for
animals should also be submitted and breeding colonies. Every 3 months 10 animals
reported when possible. Because the health from the sentinel animal population, selected
surveillance of animals used in individual in such a way as to be representative of the
experiments can be much more laborious unit (Lindsey et a1. 1991, Rehbinder &
than routine monitoring of the whole unit, it Hansen 1993) should be subjected to a full
is essential to make all monitoring data from microbiological and pathological examina-
a unit available to all investigators with tion. However, due to the higher risk of
responsibility for experiments within that infections in experimental animal popula-
unit. tions than in closed breeding colonies, more
Sentinels are put into open cages (without frequent monitoring may be necessary
Rlter tops) among the experimental popula-
tion throughout the unit in places where the Experimental animals In an experimental
possible exposure to infectious agents is unit any animal which shows clinical signs
known or thought to be maximal. The umelated to the experiment should be sub-
transmission of infectious agents may be jected to a microbiological examination as
further enhanced by transferring the sentinels part of the necropsy procedure.
into dirty cages vacated by the experimental
animals. In exceptional cases sentinels may Age of animals and time of exposure Ani-
be mixed in the same cage with animals of mals of a predetermined age as recommended
the principal population. for breeding colonies will not always be
As a general rule, health monitoring is done available for monitoring and it is not abso-
best using animals of the same species as the lutely necessary that they be used.
resident population. Strains that are particu- Sentinel animals used for microbiological
larly prone to specific infections may be used monitoring should be at least 10 weeks old
as a means of enhancing detection. Sentinels and should have been housed within the unit
could be of the same strain and from the same for a minimum of 4 weeks. When animals
breeding unit as the principal population. used for monitoring are of external origin, the
Alternatively, other microbiologically time they have heen in the unit (exposure
defined animals, preferably isolator bred, can time) is more important than their age. After
be used. longer periods of time the probability of
Immunosuppressed or immunodeficient detecting an infection by antibody testing
animals (e.g. nude mice) do not produce increases. Therefore, it is advisable to
FELASAWorking Group on Animal Health 197
monitor animals of different age and expo- VII. Health monitoring report
sure time as well as long-term sentinels.
Animals that have been bred in the same The main purpose of health monitoring is to
unit in which they are used should, when supply experimenters with data on variables
health monitored, be sampled according to that might influence the outcome of an
the FELASArecommendations for breeding experiment. These data are part of the
colonies. experimental work and have to be considered
during the interpretation of the experimental
results by the experimenter and by the reader
of a publication. Results of health monitoring
IV. Detection of previously
should, therefore, be included in scientific
undetected infections publications.
If a previously unnoticed infection is detected While FELASAcannot accept responsibil-
during monitoring procedures, a sufficient ity for tests or their implication, breeders or
number of the experimental animals should users of laboratory animals who are reporting
be examined for verification. The number of on health monitoring of their animal colonies
animals submitted for microbiological exam- may use the words 'in accordance with
ination has to be decided upon by the person FELASArecommendations' only where this
in charge of the experimental unit. is in fact the case. The use of a common
In addition, remaining sentinel animals report form will eventually result in con-
may be examined and the cumulative data formity between laboratories concerning
used to assess the incidence of the infection tests and their extent and quality. In addition
in the population. it will make it possible for researchers to
It is important that the information be compare more easily health monitoring
reported to all those who have used animals reports from different breeders and
in the intervening period since the last laboratories.
monitoring results. The problem of publishing the health
monitoring scheme in a materials and
methods section is easily solved with a
V. Microorganisms to be monitored common report format, as one has only to
refer to the FELASArecommendations. The
The list given in the recommendations for results of the health monitoring are presented
breeding colonies should be consulted for in due order in the materials and methods
guidance. section of a publication as part of the animal
It should be noted that since publication of specification.
the list, parvoviruses and pasteurellaceae
have been identified which interfere with the
interpretation of current diagnostic methods. This document was compiled using the
Positive results for parvoviruses and pasteur- combined expertise of theWorking Group
ellaceae species should be reported as such and information contained in the following
and should be identified by the specific name key references:
when possible. Attention should be paid to Bhatt PN, Jacoby RO, Morse He ill, New AE, eds
the fact that Helicobacter sp. is frequently (1986) Viral and Mycoplasmal Infections of
found in mice. Laboratory Rodents. Effects on Biomedical
Research. New York: Academic Press
Hamm TE Jr, ed. (1985) Complications of Viral and
Mycoplasmal Infection in Rodents to Toxicology
VI. Methodology Research and Testing. London: McGraw-Hill
Kraft V, Deeny AA, Blanchet HM, Boot R, Hansen AK,
The methods recommended by FELASAfor
Hem A, von Herck H, Kunst-yr I, Milite G, Needham
breeding colonies should be used. (Kraft et al. JR, Nicklas W, Perrot A, Rehbinder C, Richard Y, De
1994). In the present recommendations the Vroey G (1994) Report of the FELASA Working
gerbil has been included under the same Group on Animal Health: Recommendations for the
monitoring scheme as the hamster. health monitoring of mouse, rat, hamster, guineapig
198 FELASAWorking Group on Animal Health
and rabbit breeding colonies. Laboratory Animals antibodies with rodent viruses. Laboratory Animal
28, 1-12 Science 43, 296-300
Guidelines for the care of laboratory animals in transit Rehbinder C, Hansen AK, eds. (19931 The importance
(19921. Laboratory Animal Breeders Association of of health monitoring in laboratory animals.
Great Britain Limited (LABA) and Laboratory Scandinavian Journal of Laboratory Animal
Animal Science Association (LASA). Laboratory Science 20 no. 1, special issue on health monitoring
Animals 27, 93-107
Smith ALI Jacoby RO, Johnson EA, Paturzo F, Bhatt
Lindsey JR, Boorman GA, Collins MJ, Hsu CK, Van
PN (1993) In vivo studies with an orphan parvovirus
Hoosier GL Jr, Wagner JE (1991) Infectious Diseases
of mice. Laboratory Animal Science 43 175-82
of Rats and Mice. Washington DC: Committee of 1
Infectious Diseases of Mice and Rats; Institute of Spiegel A, Erichson S, Solleveld HA (19801 Animal
Laboratory Animal Resources, Commission of Life Quality and Models in Biomedical Research, 7th
Sciences, National Research Council, National ICLAS Symposium, Utrecht, (1979). Stuttgart, New
Academic Press. . York: Gustav Fischer
Lussier G (1988) Potential detrimental effects of Working Committee for the biological characteriza-
rodent viral infections on long-term experiments. tion of laboratory animals GV/SOLAS (1985).
Veterinary Research Communications 12, 199-217 Guidelines for speCification of animals and hus-
Nicklas W, Kraft V, Meyer B (19931 Contamination of bandry methods when reporting the results of
transplantable tumors, cell lines and monoclonal animal experiments. Laboratory Animals 19, 106-8
FElASAWorking Group on Animal Health 199
HISTORICAL lATESTTEST
results results
pos/tested pos/tested lABORATORY METHOD
BACTERIAL
AND FUNGALINFECTIONS
Clostridium pi/iforme
Bordetella bronchiseptica
Citrobacter freundii (4280)
Corynebacterium kutscheri
leptospira spp.
Serotype: ---
Serotype:---
Mycoplasma spp.
Biotype: ----
Biotype: ---
Pasteurella spp.
Biotype: ----
Biotype: ----
Salmonellae
Serotype: ---
Serotype: ---
Streptobacillus moniliformis
p-haemolytic streptococci
Lancefield grp: ---
lancefield grp: ----
lancefield grp: ----
lancefield grp: ----
Streptococcus pneumoniae
Other microorganisms associated
with lesions
PATHOLOGICAL
lESIONSOBSERVED
VIRAL INFECTIONS
Hantaan virus
Lymphocytic choriomeningitis virus
Parvovirus
Mouse hepatitis virus
Pneumonia virus of mice
Reovirus type 3
Sendai virus
Theiler's encephalomyelitis virus
Ectromelia virus
lactic dehydrogenase virus
PARASITOLOGICAL INFECTIONS
Arthropods
Gastrointestinal helminths
Giardia spp.
Entamoeba muris
Other flagellates
Eimeria spp.
Klossiella spp.
Encephalitozoon cuniculi
Toxoplasma gondii
Spironuc/eus spp.
Clostridium piliforme
Bordetella bronchiseptica
Citrobacter freundii (4280)
Corynebacterium kutscheri
Leptospira spp.
Serotype: ----
Serotype: ----
Mycoplasma spp.
Biotype: ----
Biotype: ---
Pasteurella spp.
Biotype: ----
Biotype: ----
Salmonellae
Serotype: ----
Serotype: ----
Streptobacillus moniliformis
/3-haemolytic streptococci
Lancefield grp: ----
Lancefield grp: ----
Lancefield grp: ----
Lancefield grp: ---
Streptococcus pneumoniae
Other microorganisms associated
with lesions
PATHOLOGICAL LESIONSOBSERVED
VIRAL INFECTIONS
Hantaan virus
Parvoviruses
Pneumonia virus of mice
Reovirus type 3
Sendai virus
Sialodacryadenitis/Rat corona virus
Theiler's encephalomyelitis virus
PARASITOLOGICAL INFECTIONS
Arthropods
Gastrointestinal helminths
Trichosomoides crassicauda
Giardia spp.
Entamoeba muris
Other flagellates
Eimeria spp.
Klossiella spp.
Encephalitozoon cuniculi
Toxoplasma gond;;
Spironudeus spp.
VIRAL INFECTIONS
PATHOLOGICAL LESIONSOBSERVED
PARASITOLOGICAL INFECTIONS
Arthropods
Helminths
Giardia spp.
Entamoeba muris
Other flagellates
Eimeria spp.
Encephalitozoon cuniculi
Toxoplasma gondii
Spironuc/eus spp.
Clostridium pilitorme
Bordetella bronchiseptica
Dermatophytes
Biotype: ----
Biotype: ----
Pasteurella spp.
Biotype: ----
Biotype: ----
Salmonellae
Serotype:---------
Serotype:---------
Streptobacillus monilitormis
{:I-haemolytic streptococci
Lancefield grp: ------
Lancefield grp: ------
Lancefield grp: ------
Lancefield grp: ------
Streptococcus pneumoniae
Yersinia pseudotuberculosis
Other microorganisms associated
with lesions
VIRAL INFECTIONS
Guineapig adenovirus
Lymphocytic choriomeningitis virus
Pneumonia virus of mice
Reovirus type 3
Sendai virus
Simian virus 5
PARASITOLOGICAL INFECTIONS
Arthropods
Helminths
Giardia spp.
Entamoeba muris
Other flagellates
Eimeria spp.
Klossiella spp.
Encephalitozoon cuniculi
Toxoplasma gondi;
Ciliates
VIRAL INFECTIONS
Pneumonia virus of mice
Rabbit haemorrhagic disease virus
Rabbit pox virus (myxomatosis)
Rabbit rotavirus
Sendai virus
Simian virus 5
PATHOLOGICAL LESIONSOBSERVED
PARASITOLOGICAL INFECTIONS
Arthropods
Helminths
Giardia spp.
Entamoeba muris
Other flagellates
Eimeria spp.
Encephalitozoon cuniculi
Toxoplasma gond;;