Full transcript
0:00continuing on with our categories of
0:02microorganisms now we're looking at
0:04viruses and with viruses these are going
0:07to be the smallest known infectious
0:11agents viruses require living tissue to
0:15survive and
0:17grow so what they do is they attach
0:20themselves to what's called a host cell
0:22in a person it takes over that cell that
0:26healthy cell destroys that cell and then
0:30begins to spread by destroying nearby
0:33cells with viruses some do attack
0:37immediately signs and symptoms will
0:39appear very quickly and then we also
0:41have viruses that can lie dormant for
0:43many many years and then all of a sudden
0:45they decide to show themselves and then
0:47they start going through the procedure
0:49of destroying cells and
0:52spreading uh viruses are very
0:54challenging for the lab to grow or test
0:56because they need living tissue to grow
1:00and the mutation happen so quickly the
1:03replication the changes in the cells
1:05with viruses also very difficult for
1:08scientists to be able to keep up with in
1:10the lab because of the everchanging in
1:12the
1:13replication so for instance the flu the
1:16flu is considered a virus uh we do have
1:19flu vaccinations that don't necessarily
1:22prevent us from getting the flu however
1:25what we can uh count on with those flu
1:28vaccines is that if you do come in
1:30contact with the flu it will make your
1:33symptoms less
1:34severe the reason why we have to have a
1:37flu shot or a booster done every year is
1:40because of the replication or the
1:42mutation of that virus it does not
1:45remain the same from year to year so in
1:47the lab they're not able to recreate
1:50what it is that they would like to
1:51destroy because it's constantly changing
1:54so at best with viruses we can reduce
1:57the symptoms but we cannot completely
2:00rid our body of the viruses that our
2:03body has to do on its own now here are
2:06some common disease causing
2:09viruses and there at the bottom is
2:12influenza which is the flu that I
2:13mentioned before notice their
2:16transmission for influenza is going to
2:18be airborne or
2:22droplet measles also Airborne or
2:27droplet mononucleosis at the top epsteam
2:30bar is the pathogen uh that it's
2:33categorized under or named under and it
2:37is transmitted through
2:40saliva uh Hepatitis B bloodborne or
2:44sexual
2:45transmission HIV and AIDS really good
2:48example of a virus uh bloodborne or
2:51sexual and what we know about HIV and
2:54the progression that we've had uh is
2:56that now we can actually there's
2:58actually medication on the mark Market
3:00that has the ability to make the virus
3:03almost
3:04nondetectable does it mean that the
3:06virus is not existing within the body it
3:08lies in dormant State and the symptoms
3:11and the signs are undetectable so that's
3:13a really good example of where we are in
3:15medicine and the progression as we're uh
3:18as to how we've increased over time
3:21other common disease causing viruses we
3:23have rabies which is actually Vector
3:25born your common cold common cold is
3:28called rhinovirus is the
3:30pathogen common colds or droplets or
3:33contact or also fomes so with this one
3:37we've got three ways we have the
3:38droplets where it can travel 36 feet we
3:42have direct contact and then we have
3:44fomes door knobs elevator buttons
3:50stairwells vericella zoster that's going
3:52to be chickenpox chickenpox is actually
3:55a virus that lies dormant and it's
3:58called shingles
4:00uh that virus shingles has the ability
4:03uh to transform itself or transmit
4:06itself I should say through Airborne
4:08droplet or direct contact with the
4:12blisters caused by shingles or caused by
4:15chicken
4:17pox and then our last one there is
4:19called small pots and with small pots
4:22very similar there through direct
4:24contact or fomes so that would be
4:27indirect contact