Logan Reid
The Delta variant of COVID-19, first identified in December 2020 in India, is a highly contagious form of the virus that has spread globally. It has been associated with increased hospital admissions, particularly in areas with low vaccination rates. Studies from Canada, England, Scotland, and Singapore have found that the Delta variant causes more severe illness, leading to higher risks of hospitalization, ICU admissions, and death. The risk of hospitalization was 108% higher, admission to the ICU was 235% higher, and the risk of death was 133% higher with Delta infections. This has resulted in a rise in hospital stays and ICU admissions, especially among younger age groups.
| Characteristics | Values |
|---|---|
| Highly contagious | 60% more infectious than the original virus |
| Transmissibility | Twice as transmissible as the original virus |
| Hospital admissions | 108% higher risk of hospitalisation than the initial, wild-type strain |
| ICU admissions | 235% higher risk of ICU admission than the initial, wild-type strain |
| Deaths | 133% higher risk of death than the initial, wild-type strain |
| Vaccination | Vaccines have been found to reduce hospital stays and deaths |
| Symptoms | Symptoms are generally milder for those who are fully vaccinated |
| Hospital care | Those who are fully vaccinated are less likely to need hospital care |
| Age | Cases are more prevalent in younger people |
| Underlying health conditions | People infected with the Delta variant are less likely to have underlying health conditions |
| Disease duration | The median time from first hospital admission to discharge was 19 days for the Omicron variant and 26 days for the Delta variant |
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What You'll Learn
The Delta variant is more infectious than previous strains
The SARS-CoV-2 virus, which causes COVID-19, has continued to evolve since it first emerged in late 2019. In 2021, the World Health Organization (WHO) began labelling key variants with Greek letters. The Delta variant, which emerged in late 2021, resulted in reduced vaccine effectiveness, more immune escape, and the loss of effectiveness of some treatments.
The impact of the Delta variant has been significant, particularly in California, where it fueled a relentless surge in COVID-19 cases during the summer of 2024. The Delta variant contributed to a sharp increase in infections, sending more people to emergency rooms and causing a rise in hospitalizations. However, due to prior immunity and the availability of anti-COVID medicines, the severe illness from COVID-19 has been less common during this surge.
The continuous evolution of SARS-CoV-2 leads to the emergence of new variants, such as the Delta variant, that can be more infectious and have a significant impact on public health. The ongoing circulation of the virus and its ability to evolve underscore the ongoing public health threat posed by COVID-19, especially to vulnerable individuals. While the Delta variant has caused a surge in infections and hospitalizations, the severity of illnesses and deaths has been lower compared to earlier waves of the pandemic.
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Hospital admissions are higher in areas with low vaccination rates
Health officials have warned that areas with lower vaccination rates are at greater risk of higher COVID-19 cases, hospitalizations, and deaths. Studies have shown that areas with low vaccination rates had 2.4 more new COVID-19 infections per 100,000 people compared to areas with high vaccination rates. The spread of the highly transferable Delta variant in unvaccinated parts of the country has caused spikes in hospital admissions as cases rise.
In the United States, the Delta variant has hit states with low vaccination rates particularly hard. For example, in Missouri, Arkansas, Nevada, Utah, and Florida, cases have risen faster than in any other state in the past few weeks. New infections and hospital admissions are highest in rural areas with low vaccination rates. Similarly, in Canada, a study of over 212,000 cases of COVID-19 in Ontario found that the risk of hospitalization was 108% higher with Delta infections.
The impact of low vaccination rates extends beyond higher COVID-19 cases and hospitalizations. There is also a financial cost to the healthcare system, as staff may need to call out if they get infected and are unable to serve patients due to a surge in COVID-19-related admissions. Additionally, families living in low-vaccinated areas may suffer financial and emotional costs. Adults may have to miss work and lose wages if they or their children test positive for COVID-19.
While vaccines may not completely prevent hospitalizations, they have been shown to reduce the risk of severe disease and death. Vaccines provide 80 to 90% protection against dying from COVID-19, even in cases of breakthrough infections. Therefore, it is essential to continue promoting vaccine uptake, especially in areas with low vaccination rates, to reduce the burden on healthcare systems and improve outcomes for those infected with COVID-19.
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The Delta variant is causing more severe disease
The Delta variant of COVID-19, first identified in December 2020 in India, is a highly contagious form of the virus that has spread globally. It is approximately 60% more infectious than previous strains and has resulted in a surge of cases, particularly among younger people. The Delta variant is causing more severe disease, leading to an increase in hospital admissions and intensive care unit (ICU) stays.
A Canadian study found that infections with the Delta variant resulted in a 108% higher risk of hospitalization, a 235% higher risk of admission to the ICU, and a 133% higher risk of death compared to the initial wild-type strain. Similarly, studies from England, Scotland, and Singapore have shown higher risks of adverse outcomes with Delta infections, including an increased need for emergency care, oxygen therapy, and ICU admission.
In the United States, the spread of the Delta variant has been particularly prevalent in states with low vaccination rates, such as Missouri, Arkansas, Nevada, Utah, and Florida. Hospital admissions have been highest in rural areas with low vaccination coverage, and younger age groups have been disproportionately affected during this wave of the pandemic. Frontline healthcare workers have been faced with the challenging reality of caring for patients closer to their age, resulting in exhaustion and frustration among medical staff.
The risk of severe disease and hospitalization can be significantly reduced by vaccination. Vaccines have been shown to provide 80% to 90% protection against severe disease and death from COVID-19, even in cases of breakthrough infections. The messenger RNA vaccines, such as Moderna and Pfizer, are highly effective against the Delta variant, as demonstrated by clinical studies and laboratory tests. However, the Delta variant's increased transmissibility and severity underscore the urgency of vaccination campaigns to curb its spread and prevent further hospitalizations.
In summary, the Delta variant is causing more severe disease, leading to increased hospital admissions and ICU stays, particularly in areas with low vaccination rates. Vaccination remains crucial in reducing the risk of severe illness and death associated with the Delta variant.
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Vaccines reduce hospital stays and deaths
The Delta variant of COVID-19 is a highly transmissible form of the virus, first identified in India in December 2020. It has since spread globally and is causing concern due to its increased contagiousness and severity compared to previous strains. The Delta variant has been associated with a higher risk of hospitalisation, ICU admission, and death.
Vaccines are an effective tool in combating the spread of the virus and reducing the severity of infections. In particular, the messenger RNA vaccines (Moderna and Pfizer) are highly effective against the Delta variant, providing over 80% protection against infection and 90% protection against severe disease. Clinical studies and laboratory tests have proven their effectiveness, and they are crucial in preventing hospitalisations and deaths.
Vaccines have been proven to reduce hospital stays and deaths for various diseases, including COVID-19. For instance, influenza vaccinations have been shown to reduce hospitalisations and death rates, especially in the elderly. In one study, vaccinated elderly individuals in Taiwan had lower hospitalisation rates for various conditions, including lung diseases, congestive heart failure, and renal and liver disease.
Furthermore, vaccines can lower the chance of severe illness, reducing the need for hospital stays. They are especially important for individuals with weakened immune systems, such as those with blood cancers, as they can reduce the risk of serious complications from diseases like the flu, pneumonia, and COVID-19. Vaccines may also reduce the incidence of certain infections, such as herpes zoster, and improve overall quality of life.
While there may be concerns about the safety of vaccines, the benefits far outweigh the risks. Vaccines have not been shown to cause any reproductive side effects, and even with rare conditions associated with them, vaccination is still recommended due to their effectiveness in preventing severe illness and reducing hospitalisations.
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The Delta variant affects younger people more
The Delta variant of the SARS-CoV-2 virus has been associated with increased hospital admissions, particularly in areas with low vaccination rates. This variant is significantly more contagious than previous strains, and it affects younger individuals more than older ones.
In the United States, the Delta variant caused a surge in COVID-19 cases, with a seven-day average of around 23,300 new cases per day, according to data from Johns Hopkins University. This spike in infections resulted in a corresponding increase in hospital admissions, particularly in states with lower vaccination rates.
A Canadian study published in the Canadian Medical Association Journal found that people infected with the Delta variant were, on average, younger and had a 108% higher risk of hospitalization, a 235% higher risk of admission to intensive care, and a 133% higher risk of death compared to the initial wild-type strain. This study reinforces similar findings from England, Scotland, and Singapore, indicating that the Delta variant disproportionately affects younger populations.
The higher transmission rate of the Delta variant is attributed to the increased number of viral particles in an infected person's nose and throat, leading to a higher viral load when they sneeze or cough. This higher viral load contributes to the hyper-transmission of the virus among unvaccinated individuals, including younger people.
While younger individuals are generally at lower risk of severe disease, there have been exceptions, and some young, healthy people have experienced serious illness due to the Delta variant. Vaccines play a crucial role in mitigating the impact of the Delta variant, reducing the likelihood of hospitalization and death, even in cases of breakthrough infections.
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Frequently asked questions
Yes, the Delta variant is causing more hospital admissions. It is more contagious than previous strains and causes more severe illness. This has resulted in an increase in hospitalisations, particularly in areas with low vaccination rates.
The risk of hospitalisation with the Delta variant is higher than with the initial, wild-type strain. A Canadian study found that the risk of hospitalisation was 108% higher with the Delta variant. The risk of admission to ICU was 235% higher and the risk of death was 133% higher.
Vaccination is key to reducing the risk of hospitalisation with the Delta variant. Vaccines have been shown to provide 80 to 90% protection against dying from COVID-19, even in cases of breakthrough infections. The messenger RNA vaccines (Moderna and Pfizer) are highly effective against the Delta variant, providing over 80% protection against infection and 90% protection against severe disease.
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