Microbial
What is a microbial load?
A microbial load refers to the amount or burden of unwanted microbes the body may be exposed to or carrying at any given time. This may include parasites, fungi, yeasts, or bacteria.
Not all microbes are harmful. The body naturally contains many beneficial bacteria, especially in the gut. These form part of the microbiome and help with digestion, immune balance, nutrient production, and protection against unwanted organisms.
A microbial load becomes more concerning when unwanted organisms are able to enter, settle, multiply, or disrupt normal balance. The CDC explains that for an infection to occur, germs need to enter the body, invade tissues, multiply, and cause a reaction; it also notes that people can carry germs without symptoms, known as colonisation.
For this reason, we use the word load rather than infection. It is a broader wellness term that refers to what the body may be exposed to, managing, or trying to keep in balance.
How can microbial load be acquired?
Microbial load can build from everyday exposure. Common sources include:
Food and water
Unwashed produce, undercooked foods, contaminated water, poor food handling, or exposure to animal waste can all increase the chance of picking up unwanted organisms. The CDC notes that some parasites are acquired through contaminated food or water, including food or water contaminated by stool from infected animals.
Soil, animals, and the environment
Some organisms are picked up through soil, pets, livestock, insects, mouldy environments, or outdoor exposure.
Person-to-person spread
Bacteria and other germs can spread through close contact, shared surfaces, droplets, poor hand hygiene, or contact with stool contamination. Cleveland Clinic notes that germs may spread through close contact, inhaled droplets, touching contaminated surfaces, or contact with stool.
Internal imbalance
Sometimes the issue is not a new exposure, but an imbalance. For example, fungal organisms such as yeast can naturally exist in or on the body, but may become more noticeable when the body’s normal microbial balance is disturbed. The CDC lists common fungal issues such as ringworm, nail infections, and vaginal yeast infections, and notes some environmental fungi can affect the lungs.
Where can microbial load be found in the body?
Microbial load may be associated with different areas of the body, depending on the organism and the route of exposure.
Digestive tract
The gut is one of the main areas people think of when discussing microbial load. Parasites and many bacteria can live in or pass through the digestive system. Some parasites are commonly associated with the fecal-oral route, meaning they are acquired when something contaminated with stool is swallowed.
Skin, nails, and scalp
Fungal and bacterial organisms can affect external surfaces such as the skin, nails, hair follicles, and scalp.
Mouth and respiratory tract
Some organisms enter through the mouth, nose, or lungs, especially through droplets, mould exposure, dust, or contaminated environments.
Genital and urinary areas
Yeasts and bacteria can also affect intimate areas when the normal microbial balance is disrupted.
How does the body naturally reduce microbial load?
The body is not passive. It has several natural systems that help reduce unwanted microbial burden and maintain balance.
Stomach acid
Stomach acid helps create an unfriendly environment for many unwanted organisms that enter through food or drink.
Bile and digestive secretions
Bile, enzymes, and digestive movement help break down food and move waste through the digestive tract.
Bowel motions
Regular bowel motions are one of the body’s main ways of clearing waste from the digestive system. This is why bowel regularity is often the first stage in a cleanse program.
Immune defences
The immune system recognises and responds to unwanted organisms. Mayo Clinic explains that the immune system protects against infectious agents, although some germs can evade immune defences.
Healthy microbiome
Beneficial bacteria compete with unwanted organisms for space and nutrients. A balanced gut environment can help maintain normal microbial balance.
Skin and mucous membranes
The skin, gut lining, respiratory lining, and mucous membranes act as physical barriers to reduce unwanted entry.