How Do Biofilms Form and the Problems They Can Cause?
Biofilms are among the most common and dire problems today, across the globe. It is estimated that 80% of all infections are caused by some or other form of biofilm. If you have ever noticed a slimy or sticky texture on a surface accompanied by a foul or sour odour, it is very likely that it was caused by biofilm, a growing concern for several industries.
If you want to manage and prevent biofilms, being aware of them is the first thing you need to do. This blog aims to educate you on what biofilms are, how biofilms form, what problems biofilms can cause, and more.
A] What Are Biofilms?
Biofilm is not a single microorganism but rather a whole community of different microorganisms, such as bacteria, fungi, archaea, protozoa, and algae. A biofilm forms when these different organisms come together and start to multiply on a surface. These microorganisms release a slimy extracellular matrix consisting of extracellular polysaccharides, proteins, lipids and DNA. This slimy texture is called a biofilm.
The bacteria and other organisms in the biofilm create a protective membrane around them, making them more resilient than individual cells. The bacteria in such environments usually have significantly different properties from free-floating bacteria due to lateral gene transfer. As a result, they can be detected using biofilm detection lamps and treated as quickly as possible.
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B] The Biofilm Formation Process
1. Initial Attachment
When a free-flowing bacterium comes into contact with a surface, it forms an attachment through either its appendages, like pili and flagella, electrostatic interactions, or Van der Waals forces. If the environmental or surface conditions are not favourable, the bacteria may leave the surface and return to their planktonic state.
2. Irreversible Attachment
If the conditions are favourable, the pili, flagella, and extracellular polymeric substances (EPS) help the bacteria to anchor onto the surface. This creates an irreversible attachment. If the surface is hydrophobic or non-polar, the adhesion is even stronger. As other microorganisms come in contact with the surface, the existing bacteria help to make the attachment more efficient.
3. Microcolony Formation and Growth
Once the attachment is formed, the microbes start to multiply, forming small, localised clusters of cells. These microcolonies consist of many different types of bacteria, algae, and fungi. The combination of these microbes increases the EPS formation and its resilience, creating a protective and adhesive matrix. At this point, the biofilm has begun to take shape.
4. Maturation
Once the slimy matrix is formed, the microbes can communicate with each other through auto-inducer signals. This process increases the colony’s resilience and improves the microbe density. The water paths created by bacteria are used for the intake and distribution of nutrients and the excretion of metabolic waste.
5. Dispersion
Once the biofilm is mature, the microbes in it become motile again and break free, returning to a planktonic state. The cycle then repeats itself, as the bacteria colonise another surface. This spreads the biofilm’s reach to new and unaffected areas. This process often takes place when the available nutrition in the original environment is depleted.
C] Problems Caused by Biofilms: Are Biofilms Harmful?
1. Human Health
Biofilms are responsible for 80% of all microbial and chronic infections that affect humans. If biofilms come in contact with humans, they can cause UTIs, lung infections, catheter infections, middle-ear infections, gingivitis, plaque, and much more. Diseases caused by biofilms are resistant to antibiotics and immune responses.
2. Industrial Issues
Biofilms formed on equipment, pipelines, and water systems pose contamination and health compliance risks. They are especially harmful in the food and beverage, pharmaceuticals, and packaged water industries. Additionally, they can also cause corrosion, blockages, and frequent downtime. Controlling biofilms requires costly cleaning and maintenance protocols, resulting in increased operational expenses
3. Environmental Impact
Formation of biofilms can alter and disrupt entire ecosystems. They alter nutrient cycles and oxygen levels in water bodies and invade the existing species’ habitats. Their heightened resilience makes it difficult to remove them from an environment.
D] Why Are Biofilms So Hard to Eliminate?
The microbes inside a biofilm are protected by the extracellular matrix and the presence of persister cells, making them up to five thousand times more resistant to antibiotics. As a result, they need antibiotics in much larger concentrations than their free-flowing counterparts. The gel-like matrix also prevents the antibiotics from penetrating the cells of bacteria and fungi. Their lateral gene transfer ability also allows the entire population of bacteria to adapt to harsh environments quickly and simultaneously. Meaning, they are not just shielded but also adapt to the antibiotics.
Conclusion
When different types of bacteria, fungi, archaea, protozoa, and algae come together on a surface, multiply, and form a colony, it is called a biofilm. These biofilms secrete a gel-like matrix that protects the microorganisms inside from antibiotics and other environmental factors. If not treated in time, they can be very difficult to remove.
BioDtex helps to deal with this problem. Our tech helps you detect bacteria with the naked eye, stopping their spread before the biofilm is formed. If you are interested, contact us today for a quote or inquiry.
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FAQs
Biofilms give bacteria an additional protective layer, increased tolerance for antibiotics, and an ability for horizontal gene transfer. These properties make biofilm highly resilient in comparison to its free-floating bacteria.
Biofilms can steal the nutrients from their environment, disrupting the native species. It also affects the health and wellness of all birds, mammals, and fish that come in contact with it. They can do irreparable damage to the local ecosystems if not handled properly.
The prevention, disruption, and eradication strategy is currently the best strategy for combating biofilms. BioDtex helps to identify bacterial growth before it becomes visible to the naked eye. This improves prevention efforts.
Understanding biofilms can lead to better prevention and treatment strategies for infections, improved industrial processes, and a healthier environment. Hence, public awareness of biofilms is crucial.
Temperature, precipitation, and other environmental factors play a huge role in the survival and growth of bacteria and fungi. Heavier rainfall and flooding events can introduce more microbes into water systems and increase the potential for biofilm formation. Hence, climate change can influence biofilm growth and spread.
