Common Infectious Diseases: Types, Symptoms, Causes, Treatment & Prevention

This document provides advice on those common human infectious diseases; they are diseases such as infections that occur because you are exposed to microorganisms like a virus, bacterium, fungus or parasite.

These infections can manifest and damage almost any part of the body and can transmitted through airborne respiratory particles, direct contact or objects that we use in daily life like touching contaminated articles, food and drinks consumed or through bites of insect or transmitted sexually and many other reasons.

There may be few infection are simple that they resolve themselves without any need of medical intervention however there may be some infections so severe that they can be quite fatal to man. To diminish chances to gain an infection and transmission, awareness is essential for people to be conscious regarding to transmission of diseases and recognize indicators as and when it arises.

What Are Infectious Diseases?

An infectious disease is any that has its origin within the body with any particular organisms that then multiply or produce substances in the body and cause illness, there are four categories which include: bacteria, viruses, fungi and parasites

Some examples include:

• Bacterial infections are common such asstrep throat, UTIs and tuberculosis
• Viral infections such as cold, flu, Covid-19 and hepatitis
• Fungal infections such as ringworm, thrush, fungal infection of the nails etc
• Parasitic infections include malaria, giardia and both intestinal worms

Some infectious diseases are directly contagious from person to person although they can be from other avenues too such as water, food animals and insect vectors.

How Infectious Diseases Spread

The route of transmission depends on the microorganism and the disease. Common routes include:

Examples	Transmission route
Influenza, COVID-19, common cold	Respiratory spread
Some skin and respiratory infections	Direct contact
Salmonella, giardiasis	Contaminated food or water
Malaria and other vector-borne infections	Insect bites
Some sexually transmitted infections	Sexual contact
Certain respiratory and gastrointestinal infections	Contaminated surfaces or objects
Rabies and some zoonotic infections	Animal bites or contact

Infectious agents are also transferable indirectly through contact of hands, first with a contaminated object and then subsequently with own mouth, nose and/or eyes.

Common Bacterial Infections

Bacteria are single-celled organisms, and some species can cause disease. Common bacterial infections include:

• Strep throat
• Urinary tract infections
• Tuberculosis
• Salmonella infections
• Some cases of pneumonia
• Certain sexually transmitted infections

There is a treatment for every different infection. If there are suitable bacterial infections there are also specific bacteria which can be targeted using antibiotics, viral infections cannot. Antibiotics can become resistant due to overuse.

Common Viral Infections

Frequencies of viral infections: Viruses are genetic materials which will necessitate live cells in order to multiply. The frequencies of common viral infection include the following;

• Common cold
• Influenza
• COVID-19
• Respiratory syncytial virus (RSV)
• Viral hepatitis
• Human papilloma virus ( HPV)

While most viral infections clear up after a time of supportive treatment, antiviral medications are on the market for some of the diseases they cause.

Common Fungal Infections

These can include cases of overgrowth or infections when fungi are inside the body in locations where they would normally not occur. Here are some prevalent examples:

• Ringworm
• Athletes Foot
• Fungal Nail Infections
• Oral thrush
• Yeast Infections

Fungi can infect the skin, nails, mouth, or even an inner body organ or internal system and treatments often include oral or topical antifungal treatments depending on the infection and the extent of the fungi.

Common Parasitic Infections

Parasites grow on or inside a host, and are nourished by the host. The most frequent types of infection by parasites are:

• Malaria
• Giardiasis
• Hookworm
• Pinworm
• Toxoplasmosis

The manner in which the parasite is transmitted ranges from insects spreading it, to through contaminated water or food, through contact with material infected with it or through contaminated soil.

TB: WHO calculated 10.7 million cases in 2014 and said that around 1.23 million deaths occurred related to TB.

These figures are informative, but are no absoluterankingof ‘most common’ infections worldwide, given that methods of surveillance, reporting and the definition of a disease varies among health systems.

Symptoms and Warning Signs

Symptoms differ significantly based on the type of organism involved and the area of the body it infects. Frequent symptoms may include:

• Fever
• Lethargy (tiredness)
• Coughing
• Sore throat
• Muscle ache
• Diarrhea
• Headache
• Rash
• Reduced appetite
• Specific area(s) of pain and/or swelling

Some infections causes no signs or symptoms at all; others result in a more severe form of illness.

Go to hospital immediately if signs of the illness that might indicate serious symptoms, such as the development of shortness of breath, a sudden severe headache and fever, unexplained persistent high fever, an acute rash, any sudden visual changes, or a rapid deterioration, occur.

Diagnosis and Testing

When considering whether a person need’s to be tested Healthcare professionals would generally examine any symptoms, the patients history, have a physical examination and evaluate the patient for exposure, before making a diagnosis as to if there will be any need for testing.

The type of testing for a possible infection will vary depending on what the specific illness might be:

* Blood test.
* Urine test.
* Swabs of throat or other sites.
* Stool test.
* Sputum test.
* X-Ray or other imaging.
* Specific lab tests.

Tests are crucial in allowing the health professional to diagnose the organism responsible for causing the illness, which in turn allows the health care professional to decide the best method of treatment. For instance a person having a bacterial or viral infection can often affect whether or not you would be prescribed antibiotics for example when really you do not need to have an antibiotic for a viral infection.

Treatment and Management

Treatment depends on the infectious organism, severity of illness and individual circumstances.

Infection type	Possible treatment approach
Bacterial	Antibiotics when clinically appropriate
Viral	Supportive care and antivirals for selected infections
Fungal	Topical, oral or intravenous antifungals depending on severity
Parasitic	Appropriate antiparasitic medicines

The course of every infection doesn’t necessarily involve a prescription. Mild infections can pass over without any treatment, and can just resolve as your immune system attacks the microbe. Severe infections may require treatment by an specialist, or hospital stay.

Do not take forgotten antibiotics in a course of previous antibiotics, or use antibiotics if your doctor suspects you may have a virus.

Prevention and Infection Control

By following simple practical procedures many diseases, that are preventable, can be limited:

• Regular washing hands with water and soap.
• Having received regular vaccination.
• Ensuring appropriate food and water safety.
• Limiting exposure to persons showing symptoms of contagious illness as appropriate.
• Covering mouth and nose during sneezing and coughing.
• Proper treatment and coverage of wounds.
• Using relevant protection from mosquitoes and other insects which can carry diseases.
• Practicing safer sex.

Following public health recommendations and guidance from healthcare providers during epidemic.

Hand washing and vaccination being key in the prevention of many infectious diseases.

Which Situations Are Necessary To Consult a Doctor?

Professional advice for medical assistance is required if symptoms are particularly severe or prolonged/new/developing. Especially needed when experiencing breathing problems, enduring fever, having a very high headache with fever, developing unusual rashes, when vision changes, when significantly exposed to something like animal bite.

Patients with immune deficiencies, very young children, the elderly, and those other patients who belong to the higher risk group might be in need of an earlier medical assessment.

Frequently Asked Questions

Infectious disease, What are four common kinds:

four common categories are: bacterial infection, virus infection, fungus infection and parastie infection.

What are common types of infectious disease?

Each population has different “common” types of infectious diseases based on age group, definition of disease, surveillance methods and place; commonly include respiration infection, gastrointestinal disease or several kinds of infection of skin.

How can patients be treated?

Most of disease can be effectively treated and managed depending on kinds. Antiotics, antiviral drug, antifungal medication, antiparasitic medication or good supportive therapy are most treatments.

Do antibiotic effect to virus infection?

It has no effect to virus infection such as cold or influenza. Antibiotics can only kill bacterium infection.

How to keep away from infectious disease?

It can be decreased to be infected by people using vaccine or suitable hand washing, sanitation, safe food and water supply, effective insect proof as well as good respiratory sanitation practice to control transmission.

Is the patient to be no symptoms of the Infectious diseases?

Sure it does. Infectious diseases may make mild symptoms or no symptom, because the patient may do not know he/she had infected.

Key Takeaway

Milder contagious diseases such as colds up to more severe conditions, like malaria and tuberculosis are all everyday examples of infectious diseases. Learning more about transmitting these diseases, knowing which signs & symptoms, or tests or prevention we can make better health choices.

Instead of giving yourself a prognosis when feeling sick or worried about signs & symptoms, you might want to seek a healthcare professionals opinion for severe and long lasting indications of these illnesses.