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Effects of COVID-19 prevention procedures on other common infections: a systematic review

Abstract

Introduction

Since the outbreak of the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) began, necessary measures to prevent virus transmission and reduce mortality have been implemented, including mandatory public use of masks, regular hand-sanitizing and hand-washing, social distancing, avoidance of crowds, remote work, and cancellation of public events. During and after the introduction of COVID-19 lockout, we performed a systematic review of available published literature to investigate the incidence of seasonal influenza and other respiratory viral infections.

Methods

PubMed, Embase, Web of Science, Scopus, Science Direct, Google Scholar, Research Gate, and the World Health Organization databases and websites were systematically searched for original studies concerning the impact of COVID-19 prevention means and measures on other common respiratory infectious diseases during the pandemic published by March 2021.

Results

The findings showed that the adherence to health protocols to prevent COVID-19 could help to reduce the incidence of other infectious diseases such as influenza, pneumonia, and Mycobacterium tuberculosis.

Conclusion

The implemented prevention measures and protocols might have reduced the incidence of influenza and some other common respiratory infections. However, controversies exist on this matter and future large population-based studies might provide further information to address these controversies.

Introduction

Since the beginning of the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) outbreak, necessary measures have been taken to prevent the virus transmission and reduce mortality, such as mandatory public use of mask, regular hand-sanitizing and hand-washing, remote work, social distancing, avoid gatherings, and cancellation of public events [1]. Limiting contact is a strategy that aims to reduce both the frequency and duration of contacts, lowering the basic reproduction number, R0, or the average number of people to whom one case transmits the disease during his or her incubation period [2].

As a control measure, China was the first country to implement a regional lockdown of cities in Hubei province. Wuhan, the largest city in Hubei province, with a population of over 14 million people, was subjected to a 76-day lockdown. Other countries, including Italy (provinces of Lombardy and Veneto), Spain, Russia, India, and the Philippines, later used similar lockdowns, with durations ranging from as little as 4 days in Turkey to as long as nearly a year in Qatar (3Oraby). Studies have shown that strategies have been effective in preventing the spread of the disease and reducing the incidence and mortality rates [2,3,4].

It is hypothesized that SARS-CoV-2 measures may also be effective in reducing other respiratory infectious diseases, such as seasonal influenza, outpatient pneumonia, scarlet fever, and severe acute respiratory illness (SARI) [5, 6]. Findings of recent study conducted in New Zealand showed that after 9 months of lockdown, the incidence of influenza decreased 79-fold. They have also reported a significant reduction in the incidence of other respiratory viruses during post-lockdown in comparison with the same time in the past year [7]. A reduction in the number of people infected with the influenza virus in 2020 compared to the previous year was also observed in a study from Japan [8]. Here, we assessed the reduction of the seasonal influenza virus incidence and respiratory viral infections during and after the implementation of COVID-19 lockdown.

Methods

Design

We systematically searched PubMed, Embase, Web of Science, Scopus, Science Direct, Google Scholar, Research Gate, and the World Health Organization databases and websites. After conducting the search protocol, two researchers performed a two-step screening process. First, they screened the title/abstract of the retrieved records. Then, the selected articles in the first step underwent a full-text screening and the eligible studies were identified.

Research question

We aimed to answer the following main question:

  • What was the impact of COVID-19 prevention means and measures on other common respiratory infectious diseases during the pandemic?

Search strategy

We included the final search entry [C] for this systematic review:

  1. A.

    [Viral infection] (Title/Abstract) OR [SARS] (Title/Abstract) OR [Respiratory tract infection] (Title/Abstract) OR [Interstitial lung diseases] (Title/Abstract) OR [Influenza] (Title/Abstract) OR [Inflammation] (Title/Abstract)

  2. B.

    [Coronavirus] (Title/Abstract) OR [COVID-19] (Title/Abstract) OR [SARS-CoV-2] (Title/Abstract) OR [Corona] (Title/Abstract) OR [COVID] (Title/Abstract)OR [Coronavirus infection] (Title/Abstract)OR [Pandemic] (Title/Abstract)

  3. C.

    [A] AND [B]

Eligibility criteria

English articles relevant to our research question from the start of the pandemic (December 2019) until March 2021 were included.

The exclusion criteria were as follows:

  • Review articles, editorial, commentaries, opinions, or any studies with no original data

  • Ongoing projects (e.g., articles discussing the protocol of a future study)

  • Non-human (e.g., animal and laboratory) studies

  • Duplicated results in databases.

Data collection

Two researchers read the full texts of the eligible articles and extracted the relevant findings. The collected data were utilized to construct the results section.

Results

In this study, 147 documents were identified using a systematic search strategy. After a primary review of retrieved articles, 16 duplicates were removed, and the title and abstract of the remaining were reviewed. After applying the selection criteria, 102 articles were excluded, and only 29 articles met the inclusion criteria and were included in the final review (Fig. 1). These studies were conducted in Taiwan (n = 9), between countries (n = 4), Singapore (n = 3), Japan (n = 2), South Korea (n = 2), China (n = 2), Hong Kong (n = 1), Mexico (n = 1), the Netherlands (n = 1), the European region (n = 1), Israel (n = 1), Pakistan (n = 1), and the USA (n = 1) and explored the effect of COVID-19 prevention measures on other respiratory infectious diseases. From 29 included studies, 25 were related to influenza, four related to Mycobacterium tuberculosis, four related to pneumonia, three related to rhinovirus, three related to other coronaviruses, three related to enterovirus, two related to adenovirus, and only one study was related to several respiratory infections.

Fig. 1
figure1

PRISMA 2009 flow diagram

The present study results showed that adherence to the COVID-19 preventive measures and protocols could be protective and reduce the incidence of some other respiratory infectious diseases such as influenza, pneumonia, and Mycobacterium tuberculosis.

Discussion

SARS-CoV-2, a novel coronavirus responsible for COVID-19, was first reported in China in late 2019 and then spread out rapidly worldwide [35]. COVID-19 attracted worldwide attention as an international public health emergency and the first pandemic caused by a coronavirus [36]. Many attempts were made to control the situation, such as border controls, social distancing, community education, lockdown, compulsory wearing of masks in public, and school closures [37,38,39,40]. These public health measures not only reduced SARS-CoV-2 transmission, but might also reduce transmission of other endemic viral respiratory infections [10]. In this study, we gathered and reported the findings that support or reject this hypothesis.

One of the respiratory viruses is influenza. Influenza is one of the most common respiratory infectious diseases and a highly contagious airborne disease that occurs as seasonal epidemics and manifests as an acute febrile illness with variable degrees of systemic symptoms [41]. Public health interventions and changes (such as stay-at-home orders, movement restrictions, face mask use, and school closures) in response to the SARS-CoV-2 outbreak unintentionally led to the reduction of influenzas spread in 2020 [10, 11]. Singh S et al. have noted an initial increase in influenza testing in southeastern Wisconsin followed by a dramatic decline in detection of seasonal influenza coinciding with the outbreak of SARS-CoV-2 [27]. They found that the decline in influenza detection during the 2019–2020 seasons could have been due to less testing for influenza, which may have happened if clinicians had started testing preferentially for SARS-CoV-2 during this period. However, they also responded to this by stating that influenza testing was probably much higher or the same during this period compared to previous years. As influenza and SARS-CoV-2 are symptomatically indistinguishable, they concluded that it is highly unlikely that patients with influenza decided to avoid seeking medical care [27]. Young G et al. have also found that implementing public health measures in the early fall, warranted by the first signs of either influenza or COVID-19 outbreaks, may help to reduce the transmission of both respiratory illnesses. However, they were concerned about the potential impact of a second wave of COVID-19 during the upcoming influenza season in the upcoming autumn [34].

Following a period of reduction in COVID-19 transmission over the summer, most countries observed a rise in COVID-19 cases and initiated using various preventive public health and social measures [32]. The continuation or re-implementation of several public health and social measures led to an overall reduction in circulating influenza viruses again during the winter months compared with previous seasons, particularly considering the lower basic reproduction number (R0) of influenza compared with SARS-CoV-2 [32]. Singh S et al. showed that convincing the public to change its lifestyle through policy and information—as was gained at the outset of the SARS-CoV-2 outbreak—could again reduce the impact of a “double hit” at fall and winter. These efforts saved lives directly by reducing the incidence of seasonal influenza and SARS-CoV-2, and indirectly by reducing the burden on the health system [27].

Nevertheless, this theory might not be entirely correct, and some findings are controversial. For instance, the number of documented Influenza and pneumonia deaths in the US was higher in 2020 than in 2019. Documented influenza and pneumonia deaths increased by 7.5% in 2020, although the number of influenza and pneumonia deaths was lower in 2020 than in 2017 and 2018 [42]. However, there is a concern that wrong death certificates might alter the reality of the situation, especially in the pandemic where the high burden might have resulted in wrong findings and documentation, especially for diseases with similar manifestations such as influenza and COVID-19 [43, 44].

Besides influenza, studies show a meaningful reduction in the activity and reported cases of other respiratory germs such as Mycobacterium tuberculosis, pneumonia, rhinovirus, enterovirus, adenovirus, and several other respiratory infectious diseases mentioned in Table 1 [5, 19, 20, 22, 25, 26, 29]; however, many of them are scarcely investigated. For example, measles cases in Taiwan were reported to be zero after the pandemic, possibly owing to the implemented precautions during the pandemic [12]. In supporting the above-mentioned conclusion, Lai CC et al. have noticed the significant decline of tuberculosis activity during the COVID-19 outbreak in Taiwan. Droplet aerosol precaution and prevention measures may offer success in containing SARS-CoV-2 transmission and collateral benefits in controlling tuberculosis [20]. However, Komiya K et al. have another idea about these statistics and explain them in another way. They think that the statistical decline in tuberculosis incidence following the COVID-19 outbreak is likely to have been influenced by the decreased number of tests for M. tuberculosis and may not reflect the true incidence of tuberculosis in Japan. They justified this by stating that the reactivation of tuberculosis among the elderly cannot be controlled by short-term measures for preventing SARS-CoV-2 transmission [18].

Table 1 Induced infectious diseases during COVID-19

This study has several limitations. First, it has been more than a year since the beginning of the COVID-19 pandemic; however, many aspects are still unknown and limited studies are available regarding the effect of the COVID-19 prevention measures on the spread of other respiratory infections. Second, many studies came from specific parts of the world; for example, Southeast Asia is responsible for a significant part of the studies discussed in our review. Therefore, the knowledge of the various endemic patterns related to other regions in the world is limited and we were not able to discuss it in detail. At last, novel studies might contradict the findings of our study as the knowledge on the current pandemic and its effects are rapidly evolving worldwide. Overall, this study presented novel findings on the effect of the COVID-19 prevention measures on several infections and provided valuable information to conduct future studies.

Conclusion

In conclusion, most of the studies suggested that the implemented preventive COVID-19 protocols have controlled and reduced the outbreaks of influenza and several other respiratory infectious diseases. The impact of the COVID-19 pandemic and the prevention measures on other respiratory infections could be attributed to an increase in positive testing, reduction in the patients with these infectious diseases, or in some cases, it might be due to the increased mortality of these diseases. However, the overall findings indicate the positive effect of COVID-19 preventive measures on controlling the seasonal endemics of other respiratory diseases; even though controversies still exist, and further studies are needed to clarify the exact impact of the COVID-19 on other respiratory infections.

Availability of data and materials

The authors stated that all information provided in this article could be shared.

Ethics approval and consent to participate

The present study was extracted from the research project with code IR.KHALUMS.REC.1399.001 entitled "Investigation of effective drugs for people affected by Coronavirus disease 2019 (COVID-19) in Imam Khomeyni hospital" conducted at Khalkhal University of Medical Sciences in 2020.

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Acknowledgements

The present study was conducted in collaboration with Khalkhal University of Medical Sciences, Iranian Institute for Reduction of High-Risk Behaviors, Tehran University of Medical Sciences, and Department of Global Health and Socioepidemiology, Kyoto University.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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The conception and design of the study: EM, OD; acquisition of data: AK, FV; drafting the article: EM, PM, MMP, ZP, AF, GZ, SS, HM, HB, KQ, FB; revising it critically for important intellectual content: SASA, SJ; final approval of the version to be submitted: EM, OD. All authors read and approved the final manuscript.

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Correspondence to Esmaeil Mehraeen.

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Dadras, O., Alinaghi, S.A.S., Karimi, A. et al. Effects of COVID-19 prevention procedures on other common infections: a systematic review. Eur J Med Res 26, 67 (2021). https://0-doi-org.brum.beds.ac.uk/10.1186/s40001-021-00539-1

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Keywords

  • COVID-19
  • SARS-CoV-2
  • Infection
  • Prevention