Understanding Tropical Diseases: Malaria and Pathogen Transmission

Tropical Disease Concerns: Malaria Prevention

Mosquitoes thrive in hot and humid areas, particularly in wetlands and tropical regions of the developing world. Lowering the sanitary level can increase the risk. Prevention methods include the desiccation of wetlands, and the use of insecticides and mosquito repellents.

Research Challenges in Tropical Medicine

Medicines Investigated: In the last 10 years, less than 1% of research investment has focused on diseases like Malaria (caused by Plasmodium protozoa).

Protozoa vs. Bacteria

Diseases in the developing world often lack profitable research or investment. Protozoa (eukaryotes) are phylogenetically close to us, meaning agents likely to be toxic to the protozoan may also affect human cells.

Examples of Pathogen-Caused Illnesses

Bacterial Diseases (3 Examples)

• Gastroenteritis
• Tuberculosis
• Meningitis

Diseases Caused by Protozoa and Fungi (2 Examples Each)

• Fungi: Sporotrichosis and Histoplasmosis.
• Protozoa: Malaria and Amebic Dysentery.

Viral Diseases (3 Examples)

• The Common Cold (Resfriado)
• Rabies
• Hepatitis

Essential Elements of Infectious Diseases

Infectious diseases are characterized by the occurrence of different symptoms, among which we can mention fever, malaise, and general weakness (decaimiento). Every infectious disease passes through three stages:

1. Incubation Period: The time between the agent's entry and the appearance of the first symptoms. Here, the pathogen can multiply and spread to its target areas. This period varies depending on the disease.
2. Development Period: The characteristic symptoms are discovered.
3. Convalescence: The disease is overcome, and the organism recovers.

Symptom Definition

A symptom is a subjective reference from the sick person regarding a feeling or change in perception that they recognize as anomalous, or caused by a pathological condition or illness. The term is contrasted with clinical signs, which are objective and verifiable data. A symptom is a warning that health may be threatened by something psychological, physical, social, or a combination thereof.

Clinical Signs

In medicine, clinical signs are understood as any objective manifestation resulting from a disease or impairment of health, which becomes evident to the observer in the sick individual.

Antibiotics

An antibiotic is a chemical substance, whether natural or synthetic derivative, that kills or prevents the growth of certain classes of sensitive microorganisms at low concentrations. It is used in human medicine, animal health, and horticulture to combat infections caused by germs.