Covid-19 and HIV: Not Always an Unfavorable Combination

Background A 73-years-old-man patient who had a history of Human Immunodeency Virus (HIV) infection for over 20 years was diagnosed with SARS-CoV-2 infection. Case presentation The patient was admitted to the Intensive Care Unit (ICU), where he remained for 25 days, due to a severe condition. Intubation, hemodialysis and tracheostomy were necessary to maintain homeostasis. In addition to regular treatment with etravirine, dolutegravir, darunavir and ritonavir for highly active antiretroviral therapy, the patient received To-cilizumab, which showed a great recovery in the patient's condition. Conclusion immune response, which is


Introduction
Since December 2019, an outbreak of COVID-19 appeared in Wuhan, China. The etiological agent was identi ed as a novel coronavirus closely related to the former epidemic SARS-CoV, therefore named SARS-CoV-2, a medium-sized enveloped RNA virus. The disease, COVID-19, was recognized as a pandemic by World Health Organization (WHO) on March, 2020. As the date publication of this report, more than 1,000,000 deaths due COVID-19 were con rmed (1).
COVID-19 presents as a risk for people living with HIV (PLHIV), particularly in those with low TCD4+ cell count, high viral load and other comorbidities. The infection rates in PLHIV carriers are still uncertain, once there are few published literatures relating COVID-19 co-infection in PLHIV (2).
In the present report, we describe a case of a 73-year-old-man HIV-positive that progressed to Severe Acute Respiratory Syndrome (SARS) with a successful outcome.

Case Report
On March 21, a 73-year-old man, entered the emergency room complaining of fever and dyspnea progressing over 10 days. Physical examination showed axillary temperature = 38.6ºC, blood pressure BP = 103/73 mmHg, heart rate = 88 bpm, respiratory rate = 39 bpm and pulse oximetry = 89% (O 2 nasal cannula with 3 L/min). He was put under non-rebreather mask with 10 L/min and was admitted to the ICU.
He had history of HIV infection for over 20 years, regularly treating with etravirine, dolutegravir, darunavir and ritonavir for highly active antiretroviral therapy (HAART). The last TCD4+ cell count was above 500/ µL and the viral load was undetectable for more than 5 years. He also had previous diagnosis of systemic arterial hypertension (SAH) and no history of diabetes mellitus or smoking.
On the day of admission, a nasopharyngeal swab was collected, and the RT-PCR for SARS-CoV-2 resulted positive. The virus panel for others agents was negative.
A chest computed tomography (CT) scan on admision (Figure 1-A) showed multiple ground-glass opacities, affecting all pulmonary lobes with predominantly peripheral distribution, associated with consolidation on lower lobes, with accented pulmonary involvement (> 50%). Empirical broad-spectrum antimicrobial therapy with ceftriaxone and azithromycin was started, the HAART was maintained and enoxaparin was prescribed (40mg/day).
On April 7th, tracheostomy was performed, and ve days later, he presented an improvement on respiratory condition -CT done on April 15th showed a signi cant improvement on pulmonary involvement (Figure 1-B) and mechanical ventilation was no longer needed.
On April 15th, the patient was discharged from the ICU and seven days later the tracheostomy was removed. On May 1 st the patient was discharged from the hospital, and no prescription was needed unless the use of his regular medications. Clinical chronologic outcome is showed on Figure 2.

Discussion
Worldwide, there are approximately 37.9 million PLHIV and under a higher risk of being exposed to SARS-CoV-2 (2). In Brazil, 966,058 people have been infected since 1980, being 51.2% in the Southeastern area, where the city of São Paulo is located (3). According to Centers for Disease Control and Prevention (CDC), people with HIV are in the COVID-19´s risk group, needing extra precautions. It also a rms that people with low CD4 cell count and those who are not on HIV treatment (HAART) are under an even higher probability of getting sick (4).
HIV physiopathology consists of destroy the immune cells system and speci c antibody responses, which in cases of COVID-19 association may cause a longer course of the disease (5). A recent study has shown that acute respiratory infections increased mortality in HIV-positive people in Africa (1).
Nevertheless, studies from other countries presented a different outcome, showing that COVID-19 and PLHIV association didn't impact the survival. (6) The fact that the patient was already taking antiretroviral medication is a hypothesis that would explain this scenario (6). Another factor that seems to have a positive impact on the outcome of the patients is the undetectable viral load, as recent studies suggests it results in a better general prognosis (2).
Generalized immune activation and systemic CD4 lymphocyte depletion occurs in the chronic phase of untreated HIV, also, the remaining T cells may initiate abnormal responses to antigens. The lymphocyte B dysfunction results in abnormal polyclonal activation and lack of speci c antibody responses. COVID-19 causes a signi cantly reduce in the total number of lymphocyte B, lymphocyte T and natural killer (NK) cells. The pathophysiology of the severe cases is not yet fully understood, but it appears not only to be related to virulence factors of the pathogen, but also to the dysfunctional and self-aggressive immune response triggered by the infection. This phenomenon has been called "cytokine storm" and usually occurs in the second week of infection for COVID-19, which was observed in the patient in this brief report, admitted on the tenth day of symptoms 8 .
A recent study suggests that SARS-CoV-2 may damage lymphocytes, especially T lymphocytes, and the immune system was harm during the period of disease (5). In addition to these ndings, a characteristic of COVID-19 patients is an increased laboratorial level of PCR, D-dimer and LDH, as our patient presented on the admission exams, the lung is the main organ affected by this virus, which will cause microvascular lesions, due to a systemic in ammatory response (SIR). The intestines and kidneys also have receptors that are affected by SIR, but the main concern are the kidneys, which by this process can generate low diuresis, proteinuria and changes in the amounts of albumin in the urine, requiring hemodialysis. (6,7) HIV infections can be classi ed in ve stages (0,1,2,3, or unknown), depending on negative/indeterminate result (stage 0) or test results of CD4+ T-lymphocyte associated or not with opportunistic illness. Our patient presented CD4+ lymphocyte count 876 Cells / µL, being classi ed as stage 2 (750-1,499 Cells / µL) according to CDC classi cation (8). The undetectable viral load was probably a crucial factor for the patient's positive disclosure, besides previous use of Darunavir (HAART).
Our patient is over 60-years-old-man, presenting immunode ciency, characterized by decreased in immunological system functions. These alterations trigger a rise in the incidence and severity in infectious diseases, explaining the risk of COVID-19 in this group (9). Besides being elderly, the patient has a history of SAH. When this chronic disease is treated with ACE inhibitors, present upregulation of ACE2 receptor and the raise expression of ACE2, could facilitate the viral entry (10). Beyond that, heart and lung present a high expression of ACE2 receptors (11).
Regarding treatment, the use of tocilizumab, HAART and broad-spectrum antibiotics is in accordance with the most recent literature for the treatment of COVID-19 in patients with impaired immune system functions. The only medication that has not been administered is dexamethasone, which has an important reducing factor in lung injuries and has been shown to reduce mortality in patients hospitalized with SARS-CoV-2. (12)

Conclusion
The reported patient presents the following variables as risk factors: male sex, age > 70 years and hypertension. Despite HIV infection, the patient had good adherence to HAART, TCD4 cells > 500 / µL and long-standing undetectable viral load. We choosed to maintain HAART throughout the hospitalization and this decision may have contributed to the good outcome. It is possible that all the severity of the case was due to infection by SARS-CoV-2 and dysfunctional immune response. Availability of data and materials: All data generated or analysed during this study are included in this published article [and its supplementary information les].
Competing interests: The authors declare that they have no competing interests.
Funding: This study has no source of funding.