ENVS 4012 Lecture Notes - Lecture 7: Hematemesis, Bioterrorism, Night Sweats

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Published on 19 Apr 2013
School
University of Guelph
Department
Environmental Sciences
Course
ENVS 4012
Professor
Lecture 7
Professor noticed that the number of students attending her lecture is dropping each week and
she’s sad (good multiple choice, true/false question)
Biological Diseases
Non Transmissible Diseases
Hard to determine which one of these diseases is environmental related. Many are
environmentally related and others are not
Cardiovascular diseases can be environmental related to everyday stress, or smoking or air
pollution and can be due to food.
Cancer is also in the same boat and have many factors from the environment that causes health
problems
Diabetes
Asthma are related to diseases in our environment
Transmissible Diseases
Infectious agents, bacteria, viruses, protozoa
Bacterial disease are not difficult to cure and we have antibiotics (one of the biggest discoveries
of the 20th century)
On the other hand, viruses are often immune to antibiotics. When one has the flu, the doctor
often does not prescribe antibiotics.
Many bacteria do not react negatively to antibiotics and continue to thrive. Why?
o Due to the overuse of the antibiotic making bacteria resistant (evolution, adaptation).
o Some of us ingest antibiotics without knowing. How? Through food. For example,
antibiotics are injected in livestock so they grow faster. This meat is consumed by
humans and the antibiotics enter our body.
o Bacteria have a very high reproductive rate and can change genetically rapidly.
Bacteria:
o Tuberculosis, Anthrax, Brucellosis, Different forms of plagues
Viruses:
o HIV, SARS, Bird Flu, Smallpox, West Nile
Bacterial Diseases (all environmentally related due to the social life of the person attaining the diseases
and etc)
Tuberculosis
o Very common in the past (esp. 19th century)
o Thought to be due to vampires
o When the real cause of this disease was discovered, there was no cure
o In 2004:
Almost 15 million chronic active TB cases
1.5 million deaths related to TB
Mostly occurs in developing portion of the world due to the very inefficient
health care system and the quality of life
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o It is an illness related to poor housing (not enough sun and fresh air circulating) and
related to malnutrition (e.g. poor quality food) reduce the immune system and lead
to TB.
o Not enough sleep for a long period of time can lead to TB
o It is transmitted from person to person from air droplets (no kissing, coughing, sneezing,
licking!)
o Lungs are commonly attacked by TB
o Symptoms: chest pain, coughing out blood, productive & prolonged cough for many
weeks, feverish, chills, night sweats, loss of appetite and weight, paleness, fatigue, may
affect one’s sexual desires
o S. Africa, Western Africa, Western S. America, and Asia are threatened by tuberculosis.
Not so much of a threat in N. America
Anthrax
o Very discussed in recent years, especially after Sept 11 as a subject of bioterrorism.
o Anthrax is cause Bacillus Anthracis a large gram-positive bacteria that forms spores
o Spores are dormant forms of bacteria when it is not in favourable conditions to grow.
o These bacteria produce toxins
o Three major types anthrax:
Cutaneous: all symptoms are on the skin
Inhalation: spores are inhaled
Gastrointestinal: spores or bacteria are ingested.
o Can lead to septicemia (bacteria multiply so much that the blood is overflowing with
these bacteria) and can lead to death.
o Cannot be detected by our senses
o Cannot be transferred from person to person
Cutaneous Anthrax
Occurring on the skin
Most common (> 95% of all cases)
When person gets in contact with the skin layer of animal (usually
imported)
When one gets in contact with the spores of anthrax, there is no
immediate reaction. There is a period (incubation period: 1-12) required
before the symptoms display themselves on the skin.
A tiny red dot forms and progresses into a bump which develops
vesicles and becomes an ulcer. There is no pain involved with this but
person may acquire fevers, swelling of lymph glands, headaches and
sweating.
Compared to the other forms of anthrax, it is not as severe
80% of the cases are curable especially if the treatment is applied early
Inhalation Anthrax
It is the most deadly and lethal type of anthrax
Incubation period: 1-60 days
Starts as any respiratory disease with: sore throat, mild fever, muscle
aches and then progresses to respiratory failure and possible shock if
meningitis develops
75% of these cases result in death even with treatment
Gastrointestinal Anthrax
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Document Summary

Professor noticed that the number of students attending her lecture is dropping each week and she"s sad (good multiple choice, true/false question) Hard to determine which one of these diseases is environmental related. Many are environmentally related and others are not. Cardiovascular diseases can be environmental related to everyday stress, or smoking or air pollution and can be due to food. Cancer is also in the same boat and have many factors from the environment that causes health problems. Asthma are related to diseases in our environment. Bacterial disease are not difficult to cure and we have antibiotics (one of the biggest discoveries of the 20th century) On the other hand, viruses are often immune to antibiotics. When one has the flu, the doctor often does not prescribe antibiotics. Many bacteria do not react negatively to antibiotics and continue to thrive.

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