#blood infection #infectious diseases #post-covid+2

Understanding Viral Loads and Infections

28. Oktober 2025

2 Min. Lesezeit

Ratgeber öffnen Sammlung öffnen Serie öffnen

Where is the line between "infected" and "not infected"? What affects the minimum level of infection, after which the virus breaks through the immune defense? Let's look into the question using COVID-19 as an example: why do some people not become infected with the disease, while others are infected and need to be hospitalized?

Wichtigste Erkenntnisse

Where is the line between "infected" and "not infected"?
Infectious levels
What does the degree of contagiousness depend on?

Für wen das ist

Für alle, die Bakterielle und virale Infektionen über blood infection, infectious diseases erkunden.

Warum es wichtig ist

Dieser Artikel hilft dir, dich schnell zu orientieren, und führt dich dann zu einer Sammlung oder Serie, wenn du weitermachen möchtest.

Artikelautor

Dr. Vera

Leiter der Abteilung für Therapie

Infectious levels

Infection requires a certain infectious dose (viral load), which is the smallest amount of virus that can cause infection. The larger the dose of the virus a person receives, the greater the infection burden and therefore the more severe the disease. This applies to all respiratory diseases.

For example, if a person came into a room where someone else sneezed for a few minutes, the person’s immunity has a better chance to cope with the virus than if he or she was in contact with a sick person for a long time.

Scientists have determined that each cell infected with coronavirus contains about 10 viral particles called virions. In total, a person infected with COVID-19 in an acute period carries between one billion to one hundred billion units of the virus.

What does the degree of contagiousness depend on?

The contagiousness of an infected person is directly proportional to the level of his or her viral load: low, medium, or high.

The virus multiplies especially intensively 1–3 days before and during the first 5–7 days after the appearance of disease symptoms. Generally, the viral load decreases from 7–10 days after the onset of clinical manifestations, and the person is no longer contagious.

Risk factors

What influences the load level that will infect a person?

Immunity
Chronic diseases: diabetes, respiratory diseases, diseases of the cardiovascular system,
Age: the older the person, the greater the risk
The distance from which the infection occurred: the larger space and the more dispersed the virus is, the lower its concentration
The time the virus has been on the surface: the more time has passed, the weaker it will become

Asymptomatic but dangerous

In the case of COVID-19, it is important to remember that clinical manifestations of the disease may be absent at any level of viral load.

It may be that the PCR is positive and the viral load level is high, but the disease is asymptomatic. In this case, you need to take all safety precautions and not put others at risk.

Weiterlesen

Bakterielle und virale Infektionen#rubella

Red Menace: How To Recognize Rubella

This relatively safe children's disease is extremely serious in adults and can turn into a real tragedy if it infects a pregnant woman. Because of this, it is very important to catch the symptoms and stop the spread of the virus.

Dr. Anastasia28. Okt. 2025

Bakterielle und virale Infektionen#infectious diseases

10 Important Facts About Influenza

As soon as the annual flu season arrives, the virus spreads very quickly in schools and workplaces, which can cause an epidemic. Many who fall ill recover without complications in about 1-2 weeks. However, the flu often causes serious complications, so it's important to know as much as you can about it.

Dr. Anastasia28. Okt. 2025

Coronavirus#post-covid

COVID-19 Vaccines: Why You Shouldn’t Be Afraid

When Covid-19 became a universal threat, vaccines were developed. The problem seemed to be solved. However, there is a lot of information surrounding vaccines, which makes some hesitant to get them. Let’s look at the risks associated with the vaccine and why some people are hesitant to get it?

Dr. Vera28. Okt. 2025

Blut#malaria

Defeating Malaria for Good: Scientists Are Optimistic

Researchers have identified how natural human antibodies can block the entry of malaria parasites into red blood cells. This is a key step towards ending malaria in the world.

Darya28. Okt. 2025

Installiere Ornament, um nicht nur diese Artikel zu lesen, sondern auch deine Gesundheit zu verfolgen, Testergebnisse zu speichern und auf weitere nützliche Funktionen zuzugreifen

Ornament installieren