Skip to main content

Fungal Keratitis

  • Chapter
  • First Online:
Foundations of Corneal Disease

Abstract

Fungal keratitis (FK) is one of the most challenging organisms to diagnose and treat in the field of corneal microbiology. Most organisms responsible for fungal keratitis are more virulent and pathogenic compared to other etiologies of inectious keratits, such as bacteria and/or viruses. To prevent severe outcomes in FK patients, new advances in diagnosis and treatment have been developed. Polymerase chain reaction (PCR) has gained usage as a highly sensitive and rapid diagnostic technique lowering response time from days for fungal cultures to 4–8 hours. Medical treatments have shifted from standard medications, such as natamycin, to newer triazoles such as voriconazole, or itraconazole, which offer better corneal penetration. Novel treatments have also been developed using riboflavin cross-linking (CXL) and rose bengal photodynamic antimicrobial therapy (PDAT). New improvements in technology and understanding of FK have led to better patient outcomes. These improvements include better surgical tools and techniques, such as lamellar corneal transplantation and new primers for molecular diagnosis.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Chapter
USD 29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD 84.99
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Softcover Book
USD 109.99
Price excludes VAT (USA)
  • Compact, lightweight edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Institutional subscriptions

References

  1. Mannis MJ, Holland EJ. Cornea, vol. 2. 4th ed. Edinburgh: Elsevier; 2017.

    Google Scholar 

  2. Wong TY, Ng TP, Fong KS, Tan DT. Risk factors and clinical outcomes between fungal and bacterial keratitis: a comparative study. CLAO J. 1997;23(4):275–81.

    CAS  PubMed  Google Scholar 

  3. Prajna NV, Krishnan T, Rajaraman R, Patel S, Srinivasan M, Das M, et al. Effect of Oral Voriconazole on fungal keratitis in the Mycotic Ulcer Treatment Trial II (MUTT II): arandomized clinical trial. JAMA Ophthalmol. 2016;134(12):1365–72.

    Article  PubMed  PubMed Central  Google Scholar 

  4. Ansari Z, Miller D, Galor A. Current thoughts in fungal keratitis: diagnosis and treatment. Curr Fungal Infect Rep. 2013;7(3):209–18.

    Article  PubMed  PubMed Central  Google Scholar 

  5. Wu J, Zhang WS, Zhao J, Zhou HY. Review of clinical and basic approaches of fungal keratitis. Int J Ophthalmol. 2016;9(11):1676–83.

    PubMed  PubMed Central  Google Scholar 

  6. Gao X, Zhao G, Li C, Lin J, Jiang N, Wang Q, et al. LOX-1 and TLR4 affect each other and regulate the generation of ROS in A. fumigatus keratitis. Int Immunopharmacol. 2016;40:392–9.

    Article  CAS  PubMed  Google Scholar 

  7. Hua X, Chi W, Su L, Li J, Zhang Z, Yuan X. ROS-induced oxidative injury involved in pathogenesis of fungal keratitis via p38 MAPK activation. Sci Rep. 2017;7(1):10421.

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  8. Taylor PR, Leal SM Jr, Sun Y, Pearlman E. Aspergillus and Fusarium corneal infections are regulated by Th17 cells and IL-17-producing neutrophils. J Immunol. 2014;192(7):3319–27.

    Article  CAS  PubMed  Google Scholar 

  9. Karthikeyan RS, Vareechon C, Prajna NV, Dharmalingam K, Pearlman E, Lalitha P. Interleukin 17 expression in peripheral blood neutrophils from fungal keratitis patients and healthy cohorts in southern India. J Infect Dis. 2015;211(1):130–4.

    Article  CAS  PubMed  Google Scholar 

  10. Gharamah AA, Moharram AM, Ismail MA, Al-Hussaini AK. Bacterial and fungal keratitis in upper Egypt: in vitro screening of enzymes, toxins and antifungal activity. Indian J Ophthalmol. 2014;62(2):196–203.

    Article  PubMed  PubMed Central  Google Scholar 

  11. Selvam KPSY, Shobana CS, Karunakaran NK. Extracellular enzymes and mycotoxins as virulencefactors in fusarium and aspergillus keratitis. Biosci Biotechnol Res Asia. 2014;11(2):479–90.

    Article  Google Scholar 

  12. Antonissen G, Martel A, Pasmans F, Ducatelle R, Verbrugghe E, Vandenbroucke V, et al. The impact of Fusarium mycotoxins on human and animal host susceptibility to infectious diseases. Toxins (Basel). 2014;6(2):430–52.

    Article  CAS  Google Scholar 

  13. Peraica M, Radic B, Lucic A, Pavlovic M. Toxic effects of mycotoxins in humans. Bull World Health Organ. 1999;77(9):754–66.

    CAS  PubMed  PubMed Central  Google Scholar 

  14. Raza SK, Mallet AI, Howell SA, Thomas PA. An in vitro study of the sterol content and toxin production of Fusarium isolates from mycotic keratitis. J Med Microbiol. 1994;41(3):204–8.

    Article  CAS  PubMed  Google Scholar 

  15. Naiker S, Odhav B. Mycotic keratitis: profile of Fusarium species and their mycotoxins. Mycoses. 2004;47(1–2):50–6.

    Article  CAS  PubMed  Google Scholar 

  16. Mukherjee PK, Chandra J, Yu C, Sun Y, Pearlman E, Ghannoum MA. Characterization of fusarium keratitis outbreak isolates: contribution of biofilms to antimicrobial resistance and pathogenesis. Invest Ophthalmol Vis Sci. 2012;53(8):4450–7.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  17. Oechsler RA, Yamanaka TM, Bispo PJ, Sartori J, Yu MC, Melo AS, et al. Fusarium keratitis in Brazil: genotyping, in vitro susceptibilities, and clinical outcomes. Clin Ophthalmol. 2013;7:1693–701.

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  18. Behlau I, Mukherjee K, Todani A, Tisdale AS, Cade F, Wang L, et al. Biocompatibility and biofilm inhibition of N,N-hexyl,methyl-polyethylenimine bonded to Boston Keratoprosthesis materials. Biomaterials. 2011;32(34):8783–96.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  19. Dahlgren MA, Lingappan A, Wilhelmus KR. The clinical diagnosis of microbial keratitis. Am J Ophthalmol. 2007;143(6):940–4.

    Article  PubMed  PubMed Central  Google Scholar 

  20. Zhang W, Yang H, Jiang L, Han L, Wang L. Use of potassium hydroxide, Giemsa and calcofluor white staining techniques in the microscopic evaluation of corneal scrapings for diagnosis of fungal keratitis. J Int Med Res. 2010;38(6):1961–7.

    Article  PubMed  Google Scholar 

  21. Tananuvat N, Salakthuantee K, Vanittanakom N, Pongpom M, Ausayakhun S. Prospective comparison between conventional microbial work-up vs. PCR in the diagnosis of fungal keratitis. Eye (Lond). 2012;26(10):1337–43.

    Article  CAS  Google Scholar 

  22. Ferrer C, Alio JL. Evaluation of molecular diagnosis in fungal keratitis. Ten years of experience. J Ophthalmic Inflamm Infect. 2011;1(1):15–22.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  23. Zhao G, Zhai H, Yuan Q, Sun S, Liu T, Xie L. Rapid and sensitive diagnosis of fungal keratitis with direct PCR without template DNA extraction. Clin Microbiol Infect. 2014;20(10):O776–82.

    Article  CAS  PubMed  Google Scholar 

  24. Chidambaram JD, Prajna NV, Palepu S, Lanjewar S, Shah M, Elakkiya S, et al. In vivo confocal microscopy cellular features of host and organism in bacterial, fungal, and acanthamoeba keratitis. Am J Ophthalmol. 2018;190:24–33.

    Article  PubMed  PubMed Central  Google Scholar 

  25. Kanavi MR, Javadi M, Yazdani S, Mirdehghanm S. Sensitivity and specificity of confocal scan in the diagnosis of infectious keratitis. Cornea. 2007;26(7):782–6.

    Article  PubMed  Google Scholar 

  26. Maharana PK, Sharma N, Nagpal R, Jhanji V, Das S, Vajpayee RB. Recent advances in diagnosis and management of mycotic keratitis. Indian J Ophthalmol. 2016;64(5):346–57.

    Article  PubMed  PubMed Central  Google Scholar 

  27. Prajna NV, Mascarenhas J, Krishnan T, Reddy PR, Prajna L, Srinivasan M, et al. Comparison of natamycin and voriconazole for the treatment of fungal keratitis. Arch Ophthalmol. 2010;128(6):672–8.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  28. Arora R, Gupta D, Goyal J, Kaur R. Voriconazole vs. natamycin as primary treatment in fungal corneal ulcers. Clin Exp Ophthalmol. 2011;39(5):434–40.

    Article  PubMed  Google Scholar 

  29. Tu EY, McCartney DL, Beatty RF, Springer KL, Levy J, Edward D. Successful treatment of resistant ocular fusariosis with posaconazole (SCH-56592). Am J Ophthalmol. 2007;143(2):222–7.

    Article  CAS  PubMed  Google Scholar 

  30. Tu EY, Park AJ. Recalcitrant Beauveria bassiana keratitis: confocal microscopy findings and treatment with posaconazole (Noxafil). Cornea. 2007;26(8):1008–10.

    Article  PubMed  Google Scholar 

  31. Prajna NV, Krishnan T, Mascarenhas J, Rajaraman R, Prajna L, Srinivasan M, et al. The mycotic ulcer treatment trial: a randomized trial comparing natamycin vs. voriconazole. JAMA Ophthalmol. 2013;131(4):422–9.

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  32. FlorCruz NV, Evans JR. Medical interventions for fungal keratitis. Cochrane Database Syst Rev. 2015;(4):CD004241.

    Google Scholar 

  33. Parchand S, Gupta A, Ram J, Gupta N, Chakrabarty A. Voriconazole for fungal corneal ulcers. Ophthalmology. 2012;119(5):1083.

    Article  PubMed  Google Scholar 

  34. Sharma N, Chacko J, Velpandian T, Titiyal JS, Sinha R, Satpathy G, et al. Comparative evaluation of topical vs. intrastromal voriconazole as an adjunct to natamycin in recalcitrant fungal keratitis. Ophthalmology. 2013;120(4):677–81.

    Article  PubMed  Google Scholar 

  35. Mahdy RA, Nada WM, Wageh MM. Topical amphotericin B and subconjunctival injection of fluconazole (combination therapy) vs. topical amphotericin B (monotherapy) in treatment of keratomycosis. J Ocul Pharmacol Ther. 2010;26(3):281–5.

    Article  CAS  PubMed  Google Scholar 

  36. Sharma N, Sankaran P, Agarwal T, Arora T, Chawla B, Titiyal JS, et al. Evaluation of intracameral amphotericin B in the management of fungal keratitis: randomized controlled trial. Ocul Immunol Inflamm. 2016;24(5):493–7.

    Article  CAS  PubMed  Google Scholar 

  37. Yoon KC, Jeong IY, Im SK, Chae HJ, Yang SY. Therapeutic effect of intracameral amphotericin B injection in the treatment of fungal keratitis. Cornea. 2007;26(7):814–8.

    Article  PubMed  Google Scholar 

  38. Shao Y, Yu Y, Pei CG, Tan YH, Zhou Q, Yi JL, et al. Therapeutic efficacy of intracameral amphotericin B injection for 60 patients with keratomycosis. Int J Ophthalmol. 2010;3(3):257–60.

    PubMed  PubMed Central  Google Scholar 

  39. Prajna NV, Krishnan T, Rajaraman R, Patel S, Shah R, Srinivasan M, et al. Predictors of corneal perforation or need for therapeutic keratoplasty in severe fungal keratitis: asecondary analysis of the mycotic ulcer treatment trial II. JAMA Ophthalmol. 2017;135(9):987–91.

    Article  PubMed  PubMed Central  Google Scholar 

  40. Prajna NV, Lalitha P, Rajaraman R, Krishnan T, Raghavan A, Srinivasan M, et al. Changing azole resistance: asecondary analysis of the MUTT I randomized clinical trial. JAMA Ophthalmol. 2016;134(6):693–6.

    Article  PubMed  PubMed Central  Google Scholar 

  41. Watson SL, Ramsay A, Dart JK, Bunce C, Craig E. Comparison of deep lamellar keratoplasty and penetrating keratoplasty in patients with keratoconus. Ophthalmology. 2004;111(9):1676–82.

    Article  PubMed  Google Scholar 

  42. Gao H, Song P, Echegaray JJ, Jia Y, Li S, Du M, et al. Big bubble deep anterior lamellar keratoplasty for management of deep fungal keratitis. J Ophthalmol. 2014;2014:209759.

    PubMed  PubMed Central  Google Scholar 

  43. Zhu Z, Zhang H, Yue J, Liu S, Li Z, Wang L. Antimicrobial efficacy of corneal cross-linking in vitro and in vivo for Fusarium solani: a potential new treatment for fungal keratitis. BMC Ophthalmol. 2018;18(1):65.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  44. Arafat SN, Robert MC, Shukla AN, Dohlman CH, Chodosh J, Ciolino JB. UV cross-linking of donor corneas confers resistance to keratolysis. Cornea. 2014;33(9):955–9.

    Article  PubMed  PubMed Central  Google Scholar 

  45. Wollensak G, Sporl E, Seiler T. Treatment of keratoconus by collagen cross linkingOphthalmologe. 2003;100(1):44–9.

    Article  CAS  PubMed  Google Scholar 

  46. Iseli HP, Thiel MA, Hafezi F, Kampmeier J, Seiler T. Ultraviolet a/riboflavin corneal cross-linking for infectious keratitis associated with corneal melts. Cornea. 2008;27(5):590–4.

    Article  PubMed  Google Scholar 

  47. Hamblin MR, Hasan T. Photodynamic therapy: a new antimicrobial approach to infectious disease? Photochem Photobiol Sci. 2004;3(5):436–50.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  48. Titiyal JS, Karunakaran A, Kaur M, Rathi A, Agarwal T, Sharma N. Collagen cross-linked therapeutic grafts in fungal keratitis. Ophthalmology. 2018;125(9):1471–3.

    Article  PubMed  Google Scholar 

  49. Hou Y, Le VNH, Toth G, Siebelmann S, Horstmann J, Gabriel T, et al. UV light crosslinking regresses mature corneal blood and lymphatic vessels and promotes subsequent high-risk corneal transplant survival. Am J Transplant. 2018;18(12):2873–84.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  50. Hou Y, Le VNH, Clahsen T, Schneider AC, Bock F, Cursiefen C. Photodynamic therapy leads to time-dependent regression of pathologic corneal (lymph) angiogenesis and promotes high-risk corneal allograft survival. Invest Ophthalmol Vis Sci. 2017;58(13):5862–9.

    Article  CAS  PubMed  Google Scholar 

  51. Martins SA, Combs JC, Noguera G, Camacho W, Wittmann P, Walther R, et al. Antimicrobial efficacy of riboflavin/UVA combination (365 nm) in vitro for bacterial and fungal isolates: a potential new treatment for infectious keratitis. Invest Ophthalmol Vis Sci. 2008;49(8):3402–8.

    Article  PubMed  Google Scholar 

  52. Uddaraju M, Mascarenhas J, Das MR, Radhakrishnan N, Keenan JD, Prajna L, et al. Corneal cross-linking as an adjuvant therapy in the management of recalcitrant deep stromal fungal keratitis: arandomized trial. Am J Ophthalmol. 2015;160(1):131–4 e5.

    Article  PubMed  Google Scholar 

  53. Vajpayee RB, Shafi SN, Maharana PK, Sharma N, Jhanji V. Evaluation of corneal collagen cross-linking as an additional therapy in mycotic keratitis. Clin Exp Ophthalmol. 2015;43(2):103–7.

    Article  PubMed  Google Scholar 

  54. Sauer A, Letscher-Bru V, Speeg-Schatz C, Touboul D, Colin J, Candolfi E, et al. In vitro efficacy of antifungal treatment using riboflavin/UV-A (365 nm) combination and amphotericin B. Invest Ophthalmol Vis Sci. 2010;51(8):3950–3.

    Article  PubMed  Google Scholar 

  55. Li Z, Jhanji V, Tao X, Yu H, Chen W, Mu G. Riboflavin/ultravoilet light-mediated crosslinking for fungal keratitis. Br J Ophthalmol. 2013;97(5):669–71.

    Article  PubMed  Google Scholar 

  56. Muller L, Thiel MA, Kipfer-Kauer AI, Kaufmann C. Corneal cross-linking as supplementary treatment option in melting keratitis: a case series. Klin Monatsbl Augenheilkd. 2012;229(4):411–5.

    Article  CAS  PubMed  Google Scholar 

  57. Arboleda A, Miller D, Cabot F, Taneja M, Aguilar MC, Alawa K, et al. Assessment of rose bengal versus riboflavin photodynamic therapy for inhibition of fungal keratitis isolates. Am J Ophthalmol. 2014;158(1):64–70 e2.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  58. Amescua G, Arboleda A, Nikpoor N, Durkee H, Relhan N, Aguilar MC, et al. Rose Bengal photodynamic antimicrobial therapy: anovel treatment for resistant fusarium keratitis. Cornea. 2017;36(9):1141–4.

    Article  PubMed  PubMed Central  Google Scholar 

  59. Martinez JD, Naranjo A, Amescua G, Dubovy SR, Arboleda A, Durkee H, et al. Human corneal changes after rose Bengal photodynamic antimicrobial therapy for treatment of fungal keratitis. Cornea. 2018;37(10):e46–e8.

    Article  PubMed  PubMed Central  Google Scholar 

  60. Zhu H, Alt C, Webb RH, Melki S, Kochevar IE. Corneal crosslinking with rose Bengal and green light: efficacy and safety evaluation. Cornea. 2016;35(9):1234–41.

    Article  PubMed  Google Scholar 

  61. Pellegrino F, Carrasco MA. Argon laser phototherapy in the treatment of refractory fungal keratitis. Cornea. 2013;32(1):95–7.

    Article  PubMed  Google Scholar 

  62. Khater MM. Amniotic membrane graft with argon laser photocoagulation versus amniotic membrane graft with tissue debridement for treatment of mycotic keratitis. Semin Ophthalmol. 2017;32(3):348–52.

    Article  PubMed  Google Scholar 

  63. Khater MM, El-Shorbagy MS, Selima AA. Argon laser photocoagulation versus intrastromal voriconazole injection in treatment of mycotic keratitis. Int J Ophthalmol. 2016;9(2):225–9.

    PubMed  PubMed Central  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Guillermo Amescua .

Editor information

Editors and Affiliations

Rights and permissions

Reprints and permissions

Copyright information

© 2020 Springer Nature Switzerland AG

About this chapter

Check for updates. Verify currency and authenticity via CrossMark

Cite this chapter

Martinez, J.D., Amescua, G., Alfonso, E.C. (2020). Fungal Keratitis. In: Colby, K., Dana, R. (eds) Foundations of Corneal Disease. Springer, Cham. https://doi.org/10.1007/978-3-030-25335-6_5

Download citation

  • DOI: https://doi.org/10.1007/978-3-030-25335-6_5

  • Published:

  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-25334-9

  • Online ISBN: 978-3-030-25335-6

  • eBook Packages: MedicineMedicine (R0)

Publish with us

Policies and ethics