Herd immunity (also called herd effect, community immunity, population immunity, or mass immunity) is a form of indirect protection from infectious disease that can occur with some diseases when a sufficient percentage of a population has become immune to an infection, whether through vaccination or previous infections, thereby reducing the likelihood of infection for individuals who lack immunity. Immune individuals are unlikely to contribute to disease transmission, disrupting chains of infection, which stops or slows the spread of disease. The greater the proportion of immune individuals in a community, the smaller the probability that non-immune individuals will come into contact with an infectious individual.Individuals can become immune by recovering from an earlier infection or through vaccination. Some individuals cannot become immune because of medical conditions, such as an immunodeficiency or immunosuppression, and for this group herd immunity is a crucial method of protection. Once the herd immunity threshold has been reached, disease gradually disappears from a population. This elimination, if achieved worldwide, may result in the permanent reduction in the number of infections to zero, called eradication. Herd immunity created via vaccination contributed to the eventual eradication of smallpox in 1977 and has contributed to the reduction of other diseases. Herd immunity applies only to contagious disease, meaning that it is transmitted from one individual to another. Tetanus, for example, is infectious but not contagious, so herd immunity does not apply.Herd immunity was recognized as a naturally occurring phenomenon in the 1930s when it was observed that after a significant number of children had become immune to measles, the number of new infections temporarily decreased. Mass vaccination to induce herd immunity has since become common and proved successful in preventing the spread of many infectious diseases. Opposition to vaccination has posed a challenge to herd immunity, allowing preventable diseases to persist in or return to populations with inadequate vaccination rates.The exact herd immunity threshold (HIT) varies depending on the basic reproduction number of the disease. An example of a disease with a high threshold is the measles, with a HIT exceeding 95%.
Tukiwaambia nchi hii tumepitia kipindi kigumu sana muwe mnaelewa jamani! Maana kuna watu kabisa uwezo wao wa kufikiri ni mdogo sana.
During that regime kila mwekezaji alikuwa anaogopa na wengine walifirisiwa kabisa ama moja kwa moja au kwa kuchukua pesa kwenye akaunti zao, mfano Nimrodi mkono...
After destroying the human society, the CDC now admits natural immunity works better than COVID jabs.
Sunday, September 04, 2022
After two and a half years of weaponizing public health messages and destroying the very fabric of society, the Centers for Disease Control (CDC) has decided that...
It is another good day that God has granted us. Coming back from work today and boom! I meet my baby brother Elijah who is a form one student in one of the best secondary school in our town. Right after greetings he says he wants to understand about immunization and vaccination because he has a...
The Telegraph
Sarah Knapton
Tue, August 10, 2021
Scientists have called for an end to mass testing so Britain can start to live with Covid
Scientists have called for an end to mass testing so Britain can start to live with Covid
The delta variant has wrecked any chance of herd immunity, a...
Ninachosikitika ni kuwa hizi chanjo ambazo baadhi ya watu watazipa nchi zitaenda kuua herd immunity ambayo watanzania wengi kama sio wote nchini tulikuwa tumeipata kwa muda wa takribani miaka miwili.
Kwa wasiojua, herd immunity kwa lugha ya kawaida huitwa Kinga Kundi, hii ni aina ya kinga...
Ni wazi sasa hivi kwamba Katiba imekuwa ikifanyiwa maraekebisho ya mara kwa mara, kwa convenience ya watu na siyo manufaa ya moja kwa moja ya nchi.
Serikali ilipitisha miswaada na kupitisha Bungeni merekebisho ya Katiba hivi karibuni ili viongozi wa juu kabisa akiwemo Rais, Makamu wa Rais...
Kwanza niweke wazi kuwa mimi si Daktari na wala sina utaalamu wa magonjwa ya kuambukiz bali nimetumia tu common sense na elimu ya kusoma vyanzo mbalimbali na hatimae ku-arrive at this conclusion:
Tuanze kwa kutazama herd immunity ni mini.
Herd immunity ni kinga inayotokana na sehemu kubwa ya...
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