International Journal of Coronaviruses
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Short Communication | Open Access
  • Available online freely | Peer Reviewed
  • A New Graph to Display the Epidemic Outbreaks of Covid-19 in the World

    Raúl Isea 1      

    1Fundacion Instituto de Estudios Avanzados, Hoyo de la Puerta, Baruta, Venezuela


    The paper proposes a new visualization scheme for the registry of Covid-19 cases by calculating the mantissa of the registered ones, so there is no need of performing complicated mathematical calculations. As an example, six countries are randomly selected: Australia, Brazil, China, Colombia, Portugal and Venezuela. The results show that China is the only country that keeps the epidemic under control, while Australia begins a new outbreak after having previously controlled the epidemic. Colombia and Portugal show a very similar behavior of registered cases and, finally, we can see that Venezuela, Brazil, Portugal, and Colombia present a growth of cases that may trigger new outbreaks in the future. Results are obtained from data registered at Johns Hopkins University until July 18th, 2020.

    Received 29 Jul 2020; Accepted 31 Jul 2020; Published 09 Aug 2020;

    Academic Editor:Jose Luis Turabian, Health Centre Santa Maria de Benquerencia, Spain.

    Checked for plagiarism: Yes

    Review by:Single-blind

    Copyright©  2020 Raúl Isea

    Creative Commons License    This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

    Competing interests

    The authors have declared that no competing interests exist.


    Raúl Isea (2020) A New Graph to Display the Epidemic Outbreaks of Covid-19 in the World. International Journal of Coronaviruses - 1(4):1-3.
    Download as RIS, BibTeX, Text (Include abstract )


    The World Health Organization declared a new pandemic due to Covid-19 on March 11th, 2020, and until July 25th, 2020, there have been more than 13 million infections in the world with more than six hundred thousand deaths according to the daily records made by the Johns Hopkins University. For this reason, it is necessary to design new computational methodologies that allow monitoring of cases by Covid-19 in real time, and to help design public policies that allow controlling the epidemic.

    As can be seen in the scientific literature, multiple mathematical models are being carried out to monitor the Covid-19 epidemic 1, 2, 3, 4, but they must be recalculated on a daily basis. For this reason, a simple mathematical operation is proposed to determine whether or not the epidemic is being overcome, and to visualize how severe the epidemic is in real time.

    Computational Methodology

    The daily case records for Covid-19 were obtained from the Johns Hopkins University database until July 18th, 2020, where six countries were randomly selected, i.e., Australia, Brazil, China, Colombia, Portugal and Venezuela.

    The mantissa is calculated according to the following equation:

    Mantissa (Cases) = Log10(Cases) – Integer[ (Log10(Cases)) ]

    Where Log10(Cases) is the base 10 logarithm of the cases recorded daily, and ‘Integer’ is the integer part of the value obtained. So this value is plotted based on daily records. This calculation was recently mentioned in the scientific literature 3, but without discussing its advantages.

    The advantage of using the mantissa calculation is that it is more sensitive to changes in recorded cases as opposed to a linear or logarithmic scale, since the results show how severe an epidemic outbreak can be depending on the shape of the peak of the graph instead of using a linear or logarithmic scale.


    (Figure 1) shows the results obtained in the six selected countries. This figure shows that Australia begins to show a progressive growth of cases due to Covid-19 after managing to control the epidemic, where three epidemic rebounds, i.e. number of peaks depicted in the graph, are observed after the start of the cases registered in that country.

    Figure 1. The results of the mantissa values in the following countries: Australia, Brazil, Colombia, China, Portugal and Venezuela.
    Figure 1.

    On the other hand, Colombia and Portugal show a similar behavior of the cases registered by Covid-19, where three maximums are observed after the initial outbreak, and it is also seen that the cases continue to rise along the time. China, after its initial outbreak, manages to control the epidemic. Brazil has several spikes in cases due to Covid-19, while Venezuela is starting a new epidemic rebound after showing less growth compared to its countries (Brazil and Colombia).


    The work presents a new computational methodology capable of monitoring the Covid-19 epidemic outbreaks in the world in real time, without the need for complicated mathematical calculations. Only is necessary to calculate the mantissa of the cases registered. The advantage of this calculation is that these results show how severe an epidemic outbreak can be depending on the shape of the peak of the graph, as well as monitoring the continuous epidemic rebounds in each country, revealing, for example, the slow growth of cases registered in Venezuela unlike their neighboring countries Brazil and Colombia. Therefore, it is recommended to use the calculation of the mantissa to detect how severe an epidemic is, instead of using a linear or logarithmic scale.


    I’d like to acknowledgment to Rafael Mayo-Garcia for your comments in this manuscript.


    1.Isea R. (2020) La dinámica de transmisión del Covid-2019 desde una perspectiva matemática. Revista Observador del Conocimiento,5(1):. 15.
    2.Isea R. (2020) Preliminary model to describe the transmission dynamics of Covid-19 between two neighboring cities or countries. , MedRxiv 1-11.
    3.Isea R, Longreen K E. (2020) A quick look at the registered cases of Covid-19 throughout the world. , International Journal of Coronavirus1(3): 15.
    4.Huang Y, Yang L, Dai H, Tian F, Chen K. (2020) Epidemic situation and forescasting of COVID-19 in and outside. 1-23.

    Cited by (1)

    1.Isea Raúl, Turabian Jose Luis, 2020, Characterizing the Transmission Dynamics of the Cases Registered by Covid-19 in Venezuela According to Epidemic Wave and the Value of the Mantissa, International Journal of Coronaviruses, 2(2), 8, 10.14302/issn.2692-1537.ijcv-20-3635