Claire Dawson
The Delta variant of COVID-19 is the dominant strain in the US, causing more serious disease and infecting younger people. It is very contagious, with those infected likely to spread it to twice as many people as the original strain. This has resulted in a surge of hospitalizations, particularly in areas with lower vaccination rates. A study in Iran found that hospitalized patients with the Delta variant faced long recuperation periods and high costs. In the US, pediatric hospitalizations have also surged, with the number of pediatric Covid admissions hitting a new peak in January 2022.
| Characteristics | Values |
|---|---|
| Number of patients hospitalized with the Delta variant in Dallas County | 336 |
| Number of patients hospitalized with the Delta variant in Tarrant County | 401 |
| Number of patients hospitalized with the Delta variant in Collin County | 162 |
| Number of patients hospitalized with the Delta variant in Denton County | 53 |
| Percentage of patients hospitalized with the Delta variant below the age of 55 at Cheshire | Over 50% |
| Average direct medical cost per hospitalized patient with the Delta variant | $1833.43 |
| Ratio of direct-medical costs to household's non-food expenses per hospitalized patient with the Delta variant | 2.35 |
| Percentage of patients hospitalized with the Delta variant subject to CHE | 61% |
| Delta variant characteristic | More contagious and causes more serious disease |
| Vaccines' effectiveness in preventing the Delta variant | Effective |
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What You'll Learn
- The Delta variant causes more serious disease and is highly contagious
- Vaccines are effective at preventing the Delta variant
- The Delta variant is infecting and hospitalising younger people
- Hospitalisations are higher in areas with lower vaccination rates
- The Delta variant causes longer hospital stays and recuperation periods
The Delta variant causes more serious disease and is highly contagious
The Delta variant of COVID-19 is highly contagious and causes more serious disease. It was first observed in India and then in Great Britain, sweeping through both countries before reaching North America. The Delta variant is more than twice as contagious as previous strains of COVID-19, with an R0 value between 6 and 7. This means that each infected person spreads the disease to an average of 6 to 7 other people, leading to rapid surges in cases. For example, in San Francisco, daily case levels rose towards those seen in the previous winter, despite over 70% of the population being vaccinated.
The Delta variant causes more severe disease, particularly among younger populations. Local infectious disease doctors in Dallas County, Texas, reported that more younger adults were being hospitalized with COVID-19 due to the Delta variant. The variant also causes individuals to become sicker faster, and studies have shown that it is more likely than the original virus to result in hospitalization. The highest levels of cases and severe outcomes are occurring in places with low vaccination rates.
Vaccinated individuals who contract the Delta variant typically experience mild symptoms similar to the common cold, such as a cough, fever, or headache, along with a significant loss of smell. However, vaccines are slightly less effective against the Delta variant, and breakthrough infections can occur. While hospitalizations among vaccinated individuals are rare, they are not impossible.
The financial burden of hospitalizations due to the Delta variant can be significant, with COVID-19 imposing an average of $1833.43 in direct medical costs per hospitalized patient in Iran. The long recuperation period, often involving respiratory complications and excessive fatigue, further contributes to the high costs of this disease.
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Vaccines are effective at preventing the Delta variant
Vaccines are highly effective at preventing severe illness and death from the Delta variant. The Pfizer-BioNTech COVID-19 vaccine, for instance, has been found to be 90% effective in preventing deaths due to the Delta variant. This was discovered by researchers from the University of Edinburgh, who analysed data from Scotland's national vaccine surveillance platform. This makes the Pfizer vaccine the most effective jab in the United States, with over 240 million doses administered and over 104 million Americans fully vaccinated.
Furthermore, the AstraZeneca Covid vaccine has been found to be 91% effective in preventing deaths from the Delta variant. This variant, first detected in India, is a highly contagious strain that quickly spread worldwide during the summer of 2021, becoming the dominant strain in the US in June. The potential for increased hospitalizations and deaths due to this variant was a key reason for the introduction of COVID vaccine booster shots in the country.
Vaccines are especially crucial for individuals at higher risk of severe illness from respiratory diseases, such as young children, older adults, those with underlying medical conditions, and pregnant women. The CDC's analysis of various circulating variants and their vaccine effectiveness has shown that updated COVID-19 vaccines can provide enhanced protection against dominant variants causing the most infections and hospitalizations. For instance, the updated 2023-2024 COVID-19 vaccine was effective against COVID-19 from September 2023 to January 2024, including against the XBB lineage and the new JN.1 variant.
While the Delta variant has caused a significant number of hospitalizations, particularly among younger adults, vaccines have played a crucial role in preventing severe outcomes. It is important to stay up to date with vaccinations as protection from prior infections and vaccinations can wane over time.
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The Delta variant is infecting and hospitalising younger people
The highly contagious Delta variant of COVID-19 has been infecting younger people, with rising cases among those who are unvaccinated. In the United States, the Delta variant has been spreading in areas with low vaccination rates, particularly targeting younger Americans aged 50 and under. This trend is in contrast to the previous wave driven by the D614G variant, which predominantly affected older individuals in nursing homes.
Health officials have reported a concerning increase in hospitalizations among younger adults due to the Delta variant. In Dallas County, Texas, for example, local infectious disease doctors noted that many hospitalized patients were younger than 65, including individuals in their 20s, 30s, and 50s. This shift towards younger age groups has placed a significant burden on healthcare workers and resources.
The high transmissibility of the Delta variant has resulted in a surge of infections among younger populations. According to David Wohl, MD, a professor of medicine, "people who are now getting COVID-19 are largely younger." The rapid spread of the Delta variant has been compared to that of chickenpox by the Centers for Disease Control and Prevention (CDC), emphasizing its ease of transmission.
While the Delta variant is highly contagious, it is important to note that vaccination remains effective in preventing severe disease and hospitalization. However, younger individuals, including children, teenagers, and adults, are still at risk of infection and can contribute to the spread. To protect those under 12 who are not yet eligible for vaccination, it is crucial to ensure that individuals interacting with them are vaccinated and that everyone over 12 receives their vaccine.
The impact of the Delta variant on younger people underscores the importance of vaccination and public health measures in mitigating the spread and severity of COVID-19. By increasing vaccination rates and adhering to preventive guidelines, we can protect younger individuals and slow down the emergence of new variants.
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Hospitalisations are higher in areas with lower vaccination rates
Health officials have warned that areas with lower vaccination rates are at greater risk of higher cases, hospitalizations, and deaths. Studies have shown that areas with low vaccination rates had as many as 2.4 more new COVID-19 infections per 100,000 people compared to areas with high vaccination rates. This results in a higher number of hospitalizations, putting a strain on hospitals, especially during surges. For example, in Dallas County, there were 336 patients hospitalized with COVID-19, while in Tarrant County, the number was 401.
During the Omicron wave, areas with high vaccination rates (over 60%) experienced a lower mortality rate compared to areas with low vaccination rates (<40%). Vaccinations have been shown to significantly reduce adverse outcomes, including ICU hospitalizations and deaths.
The low vaccination rates in some states, such as Arkansas and Alabama, have led to difficulties in delivering routine care and an increase in staffing costs to manage the surge in hospitalizations. Additionally, families living in areas with low vaccination rates may suffer financially and emotionally, as adults may need to miss work and incur lost wages if they or their children test positive for COVID-19.
The impact of low vaccination rates extends beyond the direct costs of hospitalizations and includes the indirect costs to individuals and the healthcare system as a whole. Thus, it is crucial to address vaccine hesitancy and drive up vaccination rates to reduce the burden on healthcare systems and improve outcomes for communities.
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The Delta variant causes longer hospital stays and recuperation periods
The highly contagious Delta variant of COVID-19 has resulted in a surge of hospitalizations worldwide. This variant is significantly more transmissible than previous strains, with health officials reporting that more young people are being hospitalized. A study conducted in Los Angeles County compared hospitalizations during the Delta-predominant period (June 19, 2021 - December 11, 2021) with those during the Omicron-predominant period (December 18, 2021 - January 3, 2023). It found that cases hospitalized during the Delta wave were more likely to have a longer length of stay and higher ICU admission rates, indicating more severe outcomes.
In Bengaluru, India, during the second wave driven by the Delta variant, numerous patients were hospitalized for extended periods. Out of nearly 250 patients hospitalized for over 21 days, 154 had been in the hospital for more than 30 days, and 170 for 21-30 days. Several patients with severe lung involvement required high-flow oxygen for a prolonged duration, contributing to longer hospital stays.
Similar trends were observed in other parts of India, such as Karnataka, where doctors attributed the longer hospital stays to the Delta variant's impact on lung pathology. Patients exhibited decreased lung compliance, severe hypoxia, and inflammatory responses, often requiring ventilator support and extended ICU stays. One patient in particular, a 60-year-old male, had to be hospitalized for over 80 days due to severe lung damage caused by the Delta variant.
A cross-sectional study conducted at Kosar Hospital in Iran from September to December 2021, during the peak of the Delta wave, found that patients hospitalized with the Delta variant had longer recuperation periods. On average, these patients were hospitalized for more than two weeks and faced challenges such as respiratory complications and excessive fatigue during their recovery. The financial implications of these extended hospital stays were also significant, with COVID-19 imposing substantial direct medical costs per hospitalized patient.
The Delta variant's ability to cause longer hospital stays and recuperation periods underscores the importance of vaccination and safety measures to prevent infections and reduce the strain on healthcare systems. While vaccination does not eliminate the risk of infection entirely, it can help reduce the severity of symptoms and decrease the likelihood of hospitalization.
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Frequently asked questions
During the height of the Delta variant's spread, a surge in hospitalizations was observed, particularly in younger individuals. In Dallas County, there were 336 patients hospitalized with COVID-19, with similar numbers reported in surrounding counties. At Texas Children's Hospital, pediatric hospitalization numbers surged, with close to 70 patients. Additionally, a study in Iran examined 400 patients hospitalized with the Delta variant from September to December 2021.
The Delta variant's high contagiousness contributed to the surge in hospitalizations. Those infected with the Delta variant were likely to spread it to twice as many people compared to the original strain. Lower vaccination rates in certain communities, particularly rural counties and minority groups, also played a role in the increased hospitalizations.
The high number of hospitalizations strained healthcare systems and led to concerns about the availability of high-quality care for all patients. The surge in hospitalizations also resulted in increased healthcare costs for patients, with COVID-19 imposing significant direct medical costs per hospitalized patient.
