Sporotrichosis is a fungal infection caused by species of the Sporothrix genus. In the found 124 publications with reports related to sporotrichosis in the Americas, 12,636 patients got infection caused by species of the genus Sporothrix. It was observed that 87.45% (11,050) were reported in South America, 11.55% (1460) in North America, and 1.00% (126) in Central America and the Caribbean.
1. Introduction
Sporotrichosis is a fungal infection caused by thermo-dimorphic fungi species of the
Sporothrix genus. Previously, the classification of the species of sporotrichosis was conducted through the classification of the
Sporothrix schenckii complex, which included
Sporothrix schenckii sensu stricto,
Sporothrix brasiliensis (
S. brasiliensis),
Sporothrix globosa (
S. globosa),
Sporothrix luriei (
S. lurieri),
Sporothrix pallida (
S. pallida),
Sporothrix mexicana (
S. mexicana), and
Sporothrix chilensis (
S. chilensis)
[1,2][1][2]. However, since 2016, the taxonomical classification of
Sporothrix has been changed into a clinical clade that includes
Sporothrix schenckii,
S. globosa,
S. brasiliensis, and S. luriei. On some occasions, the species of the environmental clade, such as
S. pallida,
S. mexicana, and
S. chilensis may cause infection upon contact with an individual
[1,2,3,4][1][2][3][4]. The infections occur mainly cutaneously or subcutaneously with lymphatic involvement
[1,2,3,4][1][2][3][4]. This infection has been considered the most frequent subcutaneous mycosis in Latin America
[2]. Such infections can be difficult to diagnose with the naked eye since they can be similar to infiltrative or ulcerative lesions from vascular and inflammatory disorders
[1,3][1][3].
For this subcutaneous infection to develop, a direct trauma must occur first. For example, inoculation occurs when the skin is punctured by plants with thorns, gardeners are a classic case of this. Also, inoculation can occur through fomites that contact contaminated soil. For instance, people who wear sandals can suffer trauma from stones, firewood, or thorns with fungal spores on their surface
[2,3][2][3]. With all the above, it can be inferred that this type of fungal infection is associated with regions where the main livelihood is agriculture, that is, in environments where the climate is tropical and subtropical. Another form of transmission, which has been increasing in recent times in some regions of the continent such as Brazil, Argentina, Paraguay, and Panama, has been reported to result from scratches, bites, pecks, and stings from different animals
[1,2,3,4][1][2][3][4].
There are several techniques for detecting sporotrichosis, including Sabouraud dextrose agar cultures, lactophenol blue or erythromycin staining, histopathological studies, and PCR sequencing, among others
[5,6,7][5][6][7] (
Figure 1).
Figure 1.
Sporothrix
spp. culture and erythromycin staining 40×.
As for the clinical forms of sporotrichosis, various types have been described, such as the lymphocutaneous, fixed cutaneous, and, as mentioned earlier, the disseminated or hematogenous forms where both organs and tissues can be affected
[5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. The latter is the rarest because the recommended antifungal regimens are usually effective; however, in patients with alterations in cellular immunity, these infections can spread
[2,3,4][2][3][4].
2. Epidemiology of Sporotrichosis in North America
A total of 48 publications related to sporotrichosis were found in North America
[5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. There were 1460 patients in total associated with infection caused by species of the genus
Sporothrix. According to the previous classification, it was found that in Canada, only two case reports were found, one from Ontario and the other from Toronto
[5,6][5][6]. In the US, 27 reports containing 1 clinical case were found (81.5%
S. schenckii, 18.5%
Sporothrix spp.,
S. schenckii complex, and
S. schenckii sensu lato)
[7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Of these, seven cases came from California, three from Oklahoma, two cases from Kansas, Texas, Arizona, Minnesota, and Florida, one case from Michigan, Nebraska, Oregon, Pennsylvania, and finally, one case without a specific city or region. In Mexico, there were 19 reports registered with 1431 reported cases (84.7%
Sporothrix spp., 14.47%
S. schenckii, 0.55%
S. globosa, 0.21%
S. schenckii sensu stricto, 0.07%
S. mexicana)
[34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. Jalisco reported 1060 cases, Guerrero 150, Nayarit 23, Zacatecas 21, Michoacan 20, Guanajuato 14, Oaxaca 9, Puebla, and San Luis Potosí 8 each, Mexico City 6, Chihuahua, Nuevo León, Querétaro, and Veracruz 2 each, Baja California, Durango, State of Mexico, and Morelos 1 each, and 99 cases were reported with an unspecified city (
Table 1). When classifying according to the current taxonomy
[1[1][2][3][4],
2,3,4], wresearche
rs can mention that in Canada, 50% of the sporotrichosis was due to
S. schenckii and 50% to
Sporothrix spp.
[5,6][5][6]. In the US, it was reported that
Sporothrix spp. (85.19%) and
S. schenckii (14.81%) were responsible for this pathology
[7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Finally, in Mexico, 85.05% were due to
Sporothrix spp., 14.33%
S. schenckii, 0.55%
S. globosa, and 0.07%
S. mexicana [34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52].
Table 1.
Epidemiology of Sporotrichosis in North America.
Region |
Country |
City |
Number of Reported Cases |
Vulnerable Population |
Diagnostic Method |
Type of Sporotrichosis |
Etiological Agents
(%) |
References |
Sex |
Age (Years) |
Taxonomy |
Before 2017 |
After 2017 |
North America |
Canada |
Ontario |
1 |
Male |
44 |
PCR sequencing (ITS region) |
Disseminated |
S. schenckii |
S. schenckii |
[5] |
Toronto |
1 |
Male |
78 |
Fungal culture,
Biopsy (Histopathology) |
Lymphocutaneous |
S. schenckii complex |
Sporothrix spp. |
[6] |
USA |
California |
1 |
Female |
7 |
Fungal culture
Biopsy (Histopathology) |
Lymphocutaneous |
S. schenckii |
Sporothrix spp. |
[7] |
Minnesota |
1 |
Male |
61 |
Fungal culture |
Disseminated |
S. schenckii |
Sporothrix spp. |
[8] |
ND |
1 |
Female |
87 |
Fungal culture |
Lymphocutaneous on the eyelid |
S. schenckii |
Sporothrix spp. |
[9] |
Pennsylvania |
1 |
Male |
67 |
Fungal culture
Biopsy (Histopathology) |
Lymphocutaneous |
S. schenckii |
Sporothrix spp. |
[10] |
Texas |
1 |
Male |
34 |
Fungal culture
Biopsy (Histopathology) |
Disseminated |
Sporothrix spp. |
Sporothrix spp. |
[11] |
Texas |
1 |
Male |
9 |
Fungal culture
Biopsy (Histopathology) |
Lymphocutaneous on the eyelid |
S. schenckii |
Sporothrix spp. |
[12] |
California |
1 |
Female |
41 |
Fungal culture |
Lymphocutaneous |
S. schenckii |
Sporothrix spp. |
[13] |
Oregon |
1 |
Male |
53 |
Fungal culture |
Disseminated |
Sporothrix spp. |
Sporothrix spp. |
[14] |
Oklahoma |
1 |
Male |
66 |
Latex agglutination test |
Disseminated |
S. schenckii |
Sporothrix spp. |
[15] |
Florida |
1 |
Male |
33 month-Old |
Fungal culture
Biopsy (Histopathology) |
Atypical lymphadenitis |
S. schenckii |
Sporothrix spp. |
[16] |
Minnesota |
1 |
Male |
49 |
Fungal culture |
Pulmonary sporotrichosis |
Sporothrix spp. |
Sporothrix spp. |
[17] |
Arizona |
1 |
Male |
56 |
Fungal culture |
Lymphocutaneous and disseminated (10 months later) |
S. schenckii |
Sporothrix spp. |
[18] |
California |
1 |
Male |
39 |
Fungal culture |
Sporothrical arthritis |
S. schenckii |
Sporothrix spp. |
[19] |
California |
1 |
Male |
89 |
Fungal culture
Biopsy (Histopathology) |
Disseminated |
S. schenckii |
Sporothrix spp. |
[20] |
Michigan |
1 |
Female |
57 |
Fungal culture
Biopsy (Histopathology) |
Lymphocutaneous |
S. schenckii |
Sporothrix spp. |
[21] |
California |
1 |
Male |
34 |
Latex agglutination test |
Chronic meningitis |
S. schenckii |
Sporothrix spp. |
[22] |
Kansas |
1 |
Male |
33 |
Fungal culture
MALDI-TOF |
Sporothrical arthritis |
S. schenckii |
Sporothrix schenckii |
[23] |
Oklahoma |
1 |
Male |
44 |
Fungal culture
Biopsy (Histopathology) |
Pulmonary sporotrichosis |
S. schenckii sensu lato |
Sporothrix spp. |
[24] |
California |
1 |
Male |
41 |
Fungal culture |
Sporothrical arthritis |
S. schenckii |
Sporothrix spp. |
[25] |
California |
1 |
Female |
35 |
Fungal culture |
Disseminated |
S. schenckii |
Sporothrix spp. |
[26] |
Nebraska |
1 |
Male |
62 |
Fungal culture
Biopsy (Histopathology) |
Disseminated |
S. schenckii |
Sporothrix spp. |
[27] |
Boston |
1 |
Female |
35 |
MALDI-TOF |
Fixed cutaneous |
S. schenckii |
S. schenckii |
[28] |
Kansas |
1 |
Male |
30 |
Fungal culture
Biopsy (Histopathology) |
Disseminated |
S. schenckii |
Sporothrix spp. |
[29] |
Florida |
1 |
Male |
76 |
History and physical examination |
Lymphocutaneous |
Sporothrix spp. |
Sporothrix spp. |
[30] |
Oklahoma |
1 |
Male |
23 |
Fungal culture |
Lymphocutaneous |
S. schenckii complex |
Sporothrix spp. |
[31] |
Washington |
1 |
Female |
44 |
Fungal culture
PCR sequencing (ITS 1–2) |
Disseminated |
S. schenckii |
S. schenckii |
[32] |
Arizona |
1 |
Female |
72 |
PCR DNA sequencing |
Laryngotracheal granulomatous disease |
S. schenckii |
S. schenckii |
[33] |
Mexico |
Veracruz |
1 |
Male |
39 |
Fungal culture
Biopsy (Histopathology) |
Atypical |
S. schenckii |
Sporothrix spp. |
[34] |
21 |