There are moments when you wake up and feel that something is not right. Just yesterday you felt fine, and today you have a heavy head, a burning throat, and a kind of fatigue you cannot quite explain. Your temperature is borderline. It is not dramatic, but it is not nothing either. And almost always, the same question comes up: “What is actually wrong with me? Influenza A, Influenza B, or COVID?”
This confusion is completely understandable. The most common viral infections begin so similarly that even in clinical practice, doctors rarely rely on symptoms alone.
When a virus attacks the body, the immune system reacts in a similar way. Most often, this includes:
- elevated temperature
- muscle and joint pain
- headache
- chills
- general fatigue
These symptoms are not caused directly by the virus itself, but by the body’s immune response. That is why, in the first 24 to 48 hours, there is practically no symptom that can reliably indicate which virus is behind the condition.
At the beginning of the pandemic, COVID was often recognized by the loss of taste and smell. Today, the clinical picture is different. Many variants present as a typical respiratory infection and can look almost identical to influenza.
Influenza is not “just a cold”
Influenza is often underestimated, but it is a serious viral illness. It can disrupt the body’s normal rhythm for weeks and lead to complications.
Influenza A tends to develop more abruptly, with a sudden rise in temperature and intense fatigue.
Influenza B usually spreads more locally, but symptoms can be prolonged and exhausting, especially in children and older adults.
For the patient, the difference is rarely obvious, but from a medical perspective, it matters.
COVID today: quieter, but broader in impact
COVID no longer appears as dramatic as in the early years, but it remains unpredictable. Unlike influenza, the virus uses receptors found in different tissues throughout the body. This explains the wider range of symptoms and why recovery can be slower and more prolonged in some people.
In practice, influenza symptoms usually appear suddenly and begin to improve after a few days. With COVID, recovery is often slower, with lingering fatigue and low energy.
Difference in contagiousness
Influenza is usually most contagious in the first days after symptoms appear. People quickly realize they are ill.
With COVID, contagiousness often begins earlier. The virus can be transmitted even when symptoms are very mild or barely noticeable.
Possible complications
In most cases, these infections pass without serious consequences, but the risk exists.
With influenza, one of the most common complications is pneumonia, as well as sinus or ear infections.
With COVID, complications can affect multiple systems in the body, including the cardiovascular system.
Why testing matters
In everyday practice, diagnosis is rarely based on symptoms alone. The reason is simple: different viruses look almost identical at the beginning.
A test provides clarity. It shows what the body is dealing with and allows the right treatment to be applied.
CHERTO tests are designed as a first line of defense in such situations.
CHERTO SARS-CoV-2 & Influenza A+B is a test for the simultaneous detection of SARS-CoV-2, Influenza A, and Influenza B using a nasal sample. It is intended for self-use and helps determine whether symptoms are related to COVID-19 or influenza at the earliest signs of discomfort.
With lab-grade accuracy, validated against gold-standard methods, the test brings reliable knowledge into your home and allows you to act in an informed, calm, and responsible way.
The most common mistake
Many people choose to wait and see how the condition develops. In practice, this often means:
- being in contact with others without knowing if they are contagious
- delayed response
- unnecessary stress
Symptoms do not become clearer on their own. They simply evolve.
I often hear: “Does it really matter which one it is?”
The truth is, it does. Because the answer determines:
- when it is safe to be around others
- whether there is a risk to your close ones
- whether medical attention is needed
When knowledge is better than assumption
In situations like this, clarity is the most valuable thing. Not waiting, but getting the right answer at the right time.
