  A novel fractal structure for the cosmological horizon, inspired by COVID-19
geometry, which results in a modified area entropy, is applied to cosmology in
order to serve dark energy. The constraints based on a complete set of
observational data are derived. There is a strong Bayesian evidence in favor of
such a dark energy in comparison to a standard $\Lambda$CDM model and that this
energy cannot be reduced to a cosmological constant. Besides, there is a shift
towards smaller values of baryon density parameter and towards larger values of
the Hubble parameter, which reduces the Hubble tension.

Cosmology and Nongalactic Astrophysics;General Relativity and Quantum Cosmology;High Energy Physics - Theory