Hmmm, this is what I get out of it. What they seem to be saying is
that there are 2 kind of viruses, enveloped viruses and non-enveloped
viruses.
The enveloped ones break down more easily. FELV is an enveloped
virus, as are FIPV, FIV, and HIV. They did some tests with other
enveloped
viruses, and depending on the conditions, the virus lasted longer than
was expected.
They did not, however, do tests on the FELV virus, and couldn't find
any that had been done on FELV; but they're assuming that it's
possibly true
that this virus can last longer in the environment that they thought
(or not).
This is an excerpt from that article - a paragraph about FELV is
underlined and bigger:
-----------------------------------------------
...
For years it was assumed that the enveloped FIPV and the other feline
coronaviruses were
quite labile and did not survive outside the cat any length of time,
perhaps a matter of hours.
However, studies in our laboratory on the survivability of FIPV on
contaminated objects
provided surprising results. Aliquots of an infectious viral
preparation were dried onto Petri
dishes and allowed to remain at room temperature for up to seven
weeks. At varying times
samples were assayed for infectious virus. There was some loss of
infectivity during the drying
process, but then the amount of infectious virus remained relatively
constant with only a gradual
decrease in viability. FIPV virus could be recovered up to seven weeks
from these dried
samples.
Results of studies on other parvoviruses, herpesviruses, and
coronaviruses of animals
were consistent with our findings. [Brown, AmJVetRes 42:1033-36, 1981]
I have attempted to find published controlled studies that address the
survivability of
FeLV in the environment, but to date I have been unable to find a
creditable report in the
literature. Absent such a study, what can we learn from other studies
that can reasonably predict
what occurs with FeLV.
Van Bueren et al. [J. Clin. Microbiol. 32(2):571-574, 1994] studied
the survival of human
immunodeficiency virus (HIV), the cause of human AIDS, in suspension
and dried on surfaces.
They looked at survival of both cell-free and cell-associated virus
either suspended in serum or
dried onto glass surfaces. Both cell-associated and cell-free HIV
suspended in serum survived
for several weeks at room temperature. Cell-free HIV that was dried
onto a glass surface
survived for at least seven days, while cell-associated HIV was
inactivated faster than cell-free
virus, but still survived up to five days. The published results of
several other studies on HIV are
consistent with the results obtained by Van Bueren et al.
FeLV, HIV, and FIV all belong to the same virus family, retroviruses.
It is reasonable to
assume that the survivability of FeLV on a contaminated surface will
be similar to that of HIV –
days to weeks rather that minutes to hours. There is no scientific
evidence to show that the
simple process of drying of FeLV immediately renders it inactive or
not infectious.
On May 18, 2008, at 8:35 PM, Sally Davis wrote:
Hi Folks,
I ran across this article updating Cornell's stance on this
subject. According to cornell the FELV virus can still survive 5-7
days in a dry environment.
http://www.vet.cornell.edu/fhc/askDr/FeLVEnvironment.pdf
--
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