Scabies: Symptoms, Causes, Treatment, and Prevention
What is Scabies?
Scabies is a skin infestation caused by the mite Sarcoptes scabiei var hominis of the Sarcoptidae family.
Morphologic Classification
- Arthropoda: Non-segmented, small body size, with 4 pairs of legs, dorsoventrally flattened, no eyes or trachea.
- Females: 300-500 microns long by 230-420 microns wide.
- Males: 213-285 microns long by 162-210 microns wide.
- Eggs: 160 microns in length.
Etiology and Life Cycle
- Parasitism Level: Obligate, living all or a phase of their life cycle inside or on the
Understanding Hypersensitivity, HIV Infection, and Transplant Rejection
Hypersensitivity
Hypersensitivity is an exaggerated immune response that, instead of protecting the body, causes multiple alterations.
Immediate Hypersensitivity Type I: Allergy
Known as allergy, this is a very quick response that appears 15 to 20 minutes after contact with the antigen (allergen). Pollen allergens can be an example. The allergic reaction takes place in three phases:
- Awareness Phase: When the body first comes into contact with the allergen, macrophages may engulf it and display its fragments
Evolutionary Theories: Lamarck, Darwin, Neo-Darwinism, and Hominization
Lamarck’s Theory of Evolution
Lamarck proposed an evolutionary theory, albeit incorrect in its explanation of how evolution occurs. He focused on the use and disuse of organs. His main points were:
- Species are not invariable; they evolve from one another.
- The use or disuse of organs causes their development or atrophy.
- These acquired characteristics through use or disuse are inherited, leading to degeneration and eventual disappearance over generations.
Darwin’s Theory of Evolution
Darwin provided the
Read MoreSexual vs Asexual Reproduction: Genetic Diversity
There are two types of reproduction: sexual and asexual. In sexual reproduction, descendants are genetically different. For example, humans reproduce through the union of gametes. Individual differences are the norm in sexual reproduction because special haploid cells, the sexual reproductive cells (meiospores and gametes), are formed by meiosis. Meiosis is the division of cells. In asexual reproduction, descendants are genetically identical. For example, roses reproduce through cuttings, where
Read MoreMaternal Health and Pregnancy Care for Nursery Nurses
Human Reproduction and Reproductive Health
Introduction to the Nursery Nurse
Human Reproduction
Sexual Cycle: Ovulation and Menstruation
Reproductive Health Maintenance
Pelvic Infections
Pelvic Pain
Menstrual Disorders
Pelvic Support Relaxation
Genital Tumors
Sex Chromosomes
Pregnancy and Maternal Health
Physiological Changes During Pregnancy
Clinical Manifestations and Diagnosis of Pregnancy
Maternal Health Controls During Pregnancy
Pregnancy Care
Childbirth and Postpartum Period
Elements of Delivery: The Delivery
Cosmos Unveiled: From Geocentric Views to Panspermia
1. Geocentric Model: The initial belief was that the Earth was the center of the universe, with the sun, moon, and stars revolving around it.
2. Copernicus and Galileo: Unlike the past, today we know the sun is the center of our solar system. Therefore, they would not be considered crazy for proposing a heliocentric model.
3. Determining Earth’s Age: The age of the Earth is determined by studying organic remains in rocks and fossils, which provide clues about its history over millions of years.
4.
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