Zaid ahmad hameed

Immunity = resistance
• The word immunity was derived from the Latin word “immunis” meaning exempt.
• It is the sum of all naturally occurring defense mechanisms that protect humans from infectious disease.
The immune system = collection of organs, cells and proteins that function to protect all the body from foreign antigens, such as bacteria, fungi, viruses and parasites
Two important types
I. Innate (natural) or non-specific immunity
II. Adaptive (acquired) or specific immunity

is an infection that is acquired in a hospital or other health facility
acquired during receiving health care that was not present during time of admission
They may occur in different areas of healthcare delivery, such as in hospitals, long-term care facilities, and ambulatory settings, and may also appear after discharge.
HAIs also include occupational infections that may affect staff

When microorganism first associated with a host, the host is said to be "contaminated". If the microorganisms establish them selves and grow and multiply for period time, the host is said to be "infected".
If infection causes damage, the host is said to have an" infectious disease".
Ecological Interactions between Organisms in a Community: Dynamic interrelationships based on nutrition and shared habitat
SYMBIOSIS: neutral, antagonistic or synergistic relationship between two dissimilar organisms living in close association with each other. It include :

Terminology in Chemotherapy
Chemotherapeutic drug: are chemical agents used for the treatment , relief or prophylaxis of a disease
Prophylaxis: use of drug to prevent infections which are about to happen for a person at risk
Antimicrobial compounds: include antibacterial , antiviral ,antifungal and antiprotozoal agents
Antibiotics: substances produced by the natural processes of some microorganisms that kills or inhibits the growth of other microorganisms

Microbiology: is a great complex of biological sciences about microorganisms, it studies organisms too small to be seen without magnification.
• Micro - too small to be seen with the naked eye
• Bio - life
• logy - study of
 Microorganisms are ubiquitous, include:
 bacteria
 viruses
 fungi
 Parasite {protozoa & helminthes (worms)}
 algae

Parasitology is the branch of biology concerned with the phenomenon of dependence of one living organism on another. Medical parasitology deals with the parasites which infect man, the diseases they produce, the response generated by him against them, and various methods of diagnosis, prevention and treatment.

Parasitology is the study of invertebrate animals capable of causing disease in humans and other animals. It is concerned with 200 or so species of helminth worms and about 80 species of protozoa that infect humans. 
 

Defi

Including 
S. aureus
S. epidermidis
S. saprophyticus
Gram +Ve
Non Motile 
Not Form Spores 
Cocci or spherical
Catalase +Ve